Bump pypa/gh-action-pypi-publish from 1.8.1 to 1.8.4 (#592)

Author: dependabot[bot]

.github/workflows/pypi.yml

@@ -28,7 +28,7 @@ jobs:
         run: |
           python -m twine check dist/*
       - name: Publish package to PyPI
-        uses: pypa/gh-action-pypi-publish@v1.8.1
+        uses: pypa/gh-action-pypi-publish@v1.8.4
         with:
           user: ${{ secrets.PYPI_USERNAME }}
           password: ${{ secrets.PYPI_PASSWORD }}