Describe the bug
Parallel steps feature has been shipped, but the action report the new properties as invalid.

Extension Version
v0.32.0

Additional context

• https://github.blog/changelog/2026-06-25-actions-steps-can-now-be-run-in-parallel/
• https://docs.github.com/en/actions/reference/workflows-and-actions/workflow-syntax#jobsjob_idstepsbackground
• Parallel Steps in GitHub Actions roadmap#1191