Pin coverage action to a sha

Author: crimsonknave

.github/workflows/coverage.yaml

@@ -28,7 +28,7 @@ jobs:
         echo "[run]" >> .coveragerc
         echo "relative_files = true" >> .coveragerc
     - name: Python Coverage Comment
-      uses: py-cov-action/python-coverage-comment-action@v3.28
+      uses: py-cov-action/python-coverage-comment-action@b2eb38dd175bf053189b35f738f9207278b00925
       with:
         GITHUB_TOKEN: ${{ github.token }}
         MERGE_COVERAGE_FILES: true