missing `x` permission on directories on pypi source tar

I wasn't able to find the code that generates the tarball that is uploaded to pypi anywhere, but I hope this reaches the right place.. the tar uploaded there is very hard to use as the directory permissions are missing `u+x` permissions:

```
tar tvf zeroconf-0.33.0.tar.gz   |head
drw-rw-rw- root/root         0 2021-07-19 07:07 zeroconf-0.33.0/
```

ideally directories would be 755 or 750
