Try different repository url key

README mentions repository-url, but then I see this in my gha output:

    Run pypa/gh-action-pypi-publish@release/v1
      with:
        repository-url: https://test.pypi.org/legacy/
        verbose: true
        user: __token__
        repository_url: https://upload.pypi.org/legacy/
        packages_dir: dist
        verify_metadata: true
        skip_existing: false
        print_hash: false

.github/workflows/pypackaging.yml

@@ -85,6 +85,6 @@ jobs:
       - name: Publish package distributions to TestPyPI
         uses: pypa/gh-action-pypi-publish@release/v1
         with:
-          repository-url: https://test.pypi.org/legacy/
+          repository_url: https://test.pypi.org/legacy/
           verbose: true