chore: downgrade python-semantic-release to v10.5.3

[farhan]

Test run to verify release behavior on python-semantic-release v10.5.3 (downgraded from v10.6.1).

matching it with sample-plugin https://github.com/openedx/sample-plugin/blob/main/.github/workflows/release.yml#L41

Both action pins updated in .github/workflows/release.yml:

• python-semantic-release → v10.5.3 (350c48fcb3ffcdfd2e0a235206bc2ecea6b69df0)
• publish-action → v10.5.3 (310a9983a0ae878b29f3aac778d7c77c1db27378)

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.17%. Comparing base (672caa0) to head (3e50dc8).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #72   +/-   ##
=======================================
  Coverage   82.17%   82.17%           
=======================================
  Files          48       48           
  Lines        1419     1419           
  Branches      110      110           
=======================================
  Hits         1166     1166           
  Misses        221      221           
  Partials       32       32           

Flag	Coverage Δ
unittests	82.17% <ø> (ø)

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