build(deps): bump pypa/gh-action-pypi-publish from 1.6.1 to 1.6.4 (#2077)

Bumps [pypa/gh-action-pypi-publish](https://github.com/pypa/gh-action-pypi-publish) from 1.6.1 to 1.6.4.
- [Release notes](https://github.com/pypa/gh-action-pypi-publish/releases)
- [Commits](pypa/gh-action-pypi-publish@v1.6.1...v1.6.4)

---
updated-dependencies:
- dependency-name: pypa/gh-action-pypi-publish
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/publish-package.yml

@@ -97,15 +97,15 @@ jobs:
       if: >-
         (github.event_name == 'push' && startsWith(github.ref, 'refs/tags/v') && github.repository == 'scikit-hep/pyhf')
         || (github.event_name == 'workflow_dispatch' && github.event.inputs.publish == 'true' && github.repository == 'scikit-hep/pyhf')
-      uses: pypa/[email protected].1
+      uses: pypa/[email protected].4
       with:
         password: ${{ secrets.test_pypi_password }}
         repository_url: https://test.pypi.org/legacy/
         print_hash: true
 
     - name: Publish distribution 📦 to PyPI
       if: github.event_name == 'release' && github.event.action == 'published' && github.repository == 'scikit-hep/pyhf'
-      uses: pypa/[email protected].1
+      uses: pypa/[email protected].4
       with:
         password: ${{ secrets.pypi_password }}
         print_hash: true