pin pypa/gh-actions-pypi-publish version (#22)

Author: ldruschk

.github/workflows/python-release.yml

@@ -20,7 +20,7 @@ jobs:
       run: |
         python -m build --sdist --wheel --outdir dist/ .
     - name: Publish to PyPI
-      uses: pypa/gh-action-pypi-publish@master
+      uses: pypa/gh-action-pypi-publish@release/v1
       with:
         user: __token__
         password: ${{ secrets.PYPI_API_TOKEN }}