ci: bump python-semantic-release/python-semantic-release action to version 9.21.0

Author: lukasbehammer

.github/workflows/release.yaml

@@ -113,7 +113,7 @@ jobs:
 
       - name: Python Semantic Release
         id: release
-        uses: python-semantic-release/python-semantic-release@v9.12.0
+        uses: python-semantic-release/python-semantic-release@v9.21.0
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}
           git_committer_name: "github-actions"
@@ -328,7 +328,7 @@ jobs:
             ./dist/*.whl
 
       - name: Publish package distributions to GitHub Releases
-        uses: python-semantic-release/publish-action@v9.12.0
+        uses: python-semantic-release/publish-action@v9.21.0
         with:
           github_token: ${{ secrets.GITHUB_TOKEN }}