Update to latest stable release of `pypi-publish` action

`pypi-publish` action's `master` branch is deprecated:

https://github.com/pypa/gh-action-pypi-publish/blob/699cd6103f50bf5c3b2f070c70712d109c168e6c/README.md#-master-branch-sunset-

.github/workflows/pypi-publish.yml

@@ -16,7 +16,4 @@ jobs:
       - name: Build
         run: python -m build --sdist --wheel
       - name: Publish to PyPI
-        uses: pypa/gh-action-pypi-publish@master
-        with:
-          user: __token__
-          password: ${{ secrets.pypi_password }}
+        uses: pypa/gh-action-pypi-publish@release/v1