[Bug]: Setting `text.usetex=True` in `pyplot.rcParams` Raises FIPS Compliance Errors

### Bug summary

If you use a FIPS (Federal Information Processing Standards) compliant Python install, then you cannot use `pyplot.show` to display a plot with  `plt.rcParams['text.usetex'] = True` due to a `hashlib.md5` call in [texmanager.py](https://github.com/matplotlib/matplotlib/blob/24bb51c834f7e6714e9ad8e24f7edb6c903028fe/lib/matplotlib/texmanager.py#L171).

This is similar to https://github.com/matplotlib/matplotlib/issues/18192 (and much of this report is modeled off of that)

There are 3 places in the code that seem to still use `hashlib.md5`:

- https://github.com/matplotlib/matplotlib/blob/24bb51c834f7e6714e9ad8e24f7edb6c903028fe/lib/matplotlib/texmanager.py#L171
- https://github.com/matplotlib/matplotlib/blob/24bb51c834f7e6714e9ad8e24f7edb6c903028fe/lib/matplotlib/sphinxext/mathmpl.py#L149
- https://github.com/matplotlib/matplotlib/blob/24bb51c834f7e6714e9ad8e24f7edb6c903028fe/lib/matplotlib/testing/compare.py#L49

There probably isn't a great reason not to replace md5 with sha256 (or something else) in these locations.

### Code for reproduction

The big requirement here is a FIPS compliant system or at least a Python install compiled to be FIPS compliant. Then the following code will reproduce the error.

To reproduce,

1. Run `sudo fips-mode-setup --enable && sudo reboot` (there may be other methods)
1. After the reboot I confirmed FIPS mode had been enabled by running `fips-mode-setup --check` and it returned FIPS mode is enabled.
1. `python3 -m venv .venv`
1. `./.venv/bin/python -m pip install matplotlib==3.10.0`
1. `./.venv/bin/python fips_error.py`. The contents of `fips_error.py` is listed below.

```python
import matplotlib.pyplot as plt

plt.rcParams['text.usetex'] = True
fig, ax = plt.subplots()
plt.text(0, 0, r'$\hat{\mathbf{x}}$')
plt.show()
```

### Actual outcome

```
$ python fips_error.py 
Exception in Tkinter callback
Traceback (most recent call last):
  File "/usr/lib64/python3.11/tkinter/__init__.py", line 1967, in __call__
    return self.func(*args)
           ^^^^^^^^^^^^^^^^
  File "/usr/lib64/python3.11/tkinter/__init__.py", line 861, in callit
    func(*args)
  File "/data/users/ktm/matplotlib_test/.venv/lib64/python3.11/site-packages/matplotlib/backends/_backend_tk.py", line 274, in idle_draw
    self.draw()
  File "/data/users/ktm/matplotlib_test/.venv/lib64/python3.11/site-packages/matplotlib/backends/backend_tkagg.py", line 10, in draw
    super().draw()
  File "/data/users/ktm/matplotlib_test/.venv/lib64/python3.11/site-packages/matplotlib/backends/backend_agg.py", line 382, in draw
    self.figure.draw(self.renderer)
  File "/data/users/ktm/matplotlib_test/.venv/lib64/python3.11/site-packages/matplotlib/artist.py", line 94, in draw_wrapper
    result = draw(artist, renderer, *args, **kwargs)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/users/ktm/matplotlib_test/.venv/lib64/python3.11/site-packages/matplotlib/artist.py", line 71, in draw_wrapper
    return draw(artist, renderer)
           ^^^^^^^^^^^^^^^^^^^^^^
  File "/data/users/ktm/matplotlib_test/.venv/lib64/python3.11/site-packages/matplotlib/figure.py", line 3257, in draw
    mimage._draw_list_compositing_images(
  File "/data/users/ktm/matplotlib_test/.venv/lib64/python3.11/site-packages/matplotlib/image.py", line 134, in _draw_list_compositing_images
    a.draw(renderer)
  File "/data/users/ktm/matplotlib_test/.venv/lib64/python3.11/site-packages/matplotlib/artist.py", line 71, in draw_wrapper
    return draw(artist, renderer)
           ^^^^^^^^^^^^^^^^^^^^^^
  File "/data/users/ktm/matplotlib_test/.venv/lib64/python3.11/site-packages/matplotlib/axes/_base.py", line 3181, in draw
    mimage._draw_list_compositing_images(
  File "/data/users/ktm/matplotlib_test/.venv/lib64/python3.11/site-packages/matplotlib/image.py", line 134, in _draw_list_compositing_images
    a.draw(renderer)
  File "/data/users/ktm/matplotlib_test/.venv/lib64/python3.11/site-packages/matplotlib/artist.py", line 71, in draw_wrapper
    return draw(artist, renderer)
           ^^^^^^^^^^^^^^^^^^^^^^
  File "/data/users/ktm/matplotlib_test/.venv/lib64/python3.11/site-packages/matplotlib/axis.py", line 1416, in draw
    tlb1, tlb2 = self._get_ticklabel_bboxes(ticks_to_draw, renderer)
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/users/ktm/matplotlib_test/.venv/lib64/python3.11/site-packages/matplotlib/axis.py", line 1343, in _get_ticklabel_bboxes
    return ([tick.label1.get_window_extent(renderer)
            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/users/ktm/matplotlib_test/.venv/lib64/python3.11/site-packages/matplotlib/axis.py", line 1343, in <listcomp>
    return ([tick.label1.get_window_extent(renderer)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/users/ktm/matplotlib_test/.venv/lib64/python3.11/site-packages/matplotlib/text.py", line 969, in get_window_extent
    bbox, info, descent = self._get_layout(self._renderer)
                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/users/ktm/matplotlib_test/.venv/lib64/python3.11/site-packages/matplotlib/text.py", line 373, in _get_layout
    _, lp_h, lp_d = _get_text_metrics_with_cache(
                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/users/ktm/matplotlib_test/.venv/lib64/python3.11/site-packages/matplotlib/text.py", line 69, in _get_text_metrics_with_cache
    return _get_text_metrics_with_cache_impl(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/users/ktm/matplotlib_test/.venv/lib64/python3.11/site-packages/matplotlib/text.py", line 77, in _get_text_metrics_with_cache_impl
    return renderer_ref().get_text_width_height_descent(text, fontprop, ismath)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/users/ktm/matplotlib_test/.venv/lib64/python3.11/site-packages/matplotlib/backends/backend_agg.py", line 211, in get_text_width_height_descent
    return super().get_text_width_height_descent(s, prop, ismath)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/users/ktm/matplotlib_test/.venv/lib64/python3.11/site-packages/matplotlib/backend_bases.py", line 566, in get_text_width_height_descent
    return self.get_texmanager().get_text_width_height_descent(
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/users/ktm/matplotlib_test/.venv/lib64/python3.11/site-packages/matplotlib/texmanager.py", line 360, in get_text_width_height_descent
    dvifile = cls.make_dvi(tex, fontsize)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/users/ktm/matplotlib_test/.venv/lib64/python3.11/site-packages/matplotlib/texmanager.py", line 276, in make_dvi
    basefile = cls.get_basefile(tex, fontsize)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/data/users/ktm/matplotlib_test/.venv/lib64/python3.11/site-packages/matplotlib/texmanager.py", line 171, in get_basefile
    filehash = hashlib.md5(src.encode('utf-8')).hexdigest()
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
ValueError: [digital envelope routines: EVP_DigestInit_ex] disabled for FIPS
```

### Expected outcome

No exception related to FIPS and the plot is created.

### Additional information

```
$ .venv/bin/python -m pip list
Package         Version
--------------- -----------
contourpy       1.3.1
cycler          0.12.1
fonttools       4.56.0
kiwisolver      1.4.8
matplotlib      3.10.0
numpy           2.2.2
packaging       24.2
pillow          11.1.0
pip             22.3.1
pyparsing       3.2.1
python-dateutil 2.9.0.post0
setuptools      65.5.1
six             1.17.0
```

### Operating system

RHEL 8.10 (with FIPS enabled)

### Matplotlib Version

3.10.0

### Matplotlib Backend

tkagg

### Python version

Python 3.11.9


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[Bug]: Setting `text.usetex=True` in `pyplot.rcParams` Raises FIPS Compliance Errors #29603

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Uh oh!

[Bug]: Setting text.usetex=True in pyplot.rcParams Raises FIPS Compliance Errors #29603

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Bug summary

Code for reproduction

Actual outcome

Expected outcome

Additional information

Operating system

Matplotlib Version

Matplotlib Backend

Python version

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[Bug]: Setting `text.usetex=True` in `pyplot.rcParams` Raises FIPS Compliance Errors #29603