ci: use tag for pypa/gh-action-pypi-publish

Author: haraldh

.github/workflows/publish.yml

@@ -32,13 +32,13 @@ jobs:
           .
 
       - name: Publish distribution 📦 to Test PyPI
-        uses: pypa/gh-action-pypi-publish@master
+        uses: pypa/gh-action-pypi-publish@v1.12.4
         with:
           password: ${{ secrets.TEST_PYPI_API_TOKEN }}
           repository_url: https://test.pypi.org/legacy/
 
       - name: Publish distribution 📦 to PyPI
         if: startsWith(github.ref, 'refs/tags')
-        uses: pypa/gh-action-pypi-publish@master
+        uses: pypa/gh-action-pypi-publish@v1.12.4
         with:
           password: ${{ secrets.PYPI_API_TOKEN }}