Hotfix: Incorrect version of pypi publisher specified in tags-to-pypi…

… github action.

.github/workflows/tags-to-pypi.yml

@@ -11,17 +11,17 @@ jobs:
         runs-on: ubuntu-18.04
         steps:
             - uses: actions/checkout@main
-            - name: Set up Python 3.7
+            - name: Set up Python 3.8
               uses: actions/setup-python@v1
               with:
-                python-version: 3.7
+                python-version: 3.8
             - name: Build tarballs
               run: |
                 pip install wheel
                 python setup.py bdist_wheel
                 python setup.py sdist --formats=gztar
             - name: Publish artifacts to PyPI
-              uses: pypa/gh-action-pypi-publish@main
+              uses: pypa/gh-action-pypi-publish@master
               with:
                 password: ${{ secrets.PYPI_PASSWORD }}
                 repository_url: https://upload.pypi.org/legacy/