chore(ci): bump python-semantic-release/python-semantic-release

Bumps the github-actions group with 1 update: [python-semantic-release/python-semantic-release](https://github.com/python-semantic-release/python-semantic-release).


Updates `python-semantic-release/python-semantic-release` from 9.17.0 to 9.21.0
- [Release notes](https://github.com/python-semantic-release/python-semantic-release/releases)
- [Changelog](https://github.com/python-semantic-release/python-semantic-release/blob/master/CHANGELOG.rst)
- [Commits](python-semantic-release/python-semantic-release@v9.17.0...v9.21.0)

---
updated-dependencies:
- dependency-name: python-semantic-release/python-semantic-release
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: github-actions
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/ci.yml

@@ -113,14 +113,14 @@ jobs:
 
       # Do a dry run of PSR
       - name: Test release
-        uses: python-semantic-release/python-semantic-release@v9.17.0
+        uses: python-semantic-release/python-semantic-release@v9.21.0
         if: github.ref_name != 'main'
         with:
           root_options: --noop
 
       # On main branch: actual PSR + upload to PyPI & GitHub
       - name: Release
-        uses: python-semantic-release/python-semantic-release@v9.17.0
+        uses: python-semantic-release/python-semantic-release@v9.21.0
         id: release
         if: github.ref_name == 'main'
         with: