Update actions versions and ingore existing PyPI versions #56
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The actions checkout and setup-python have never versions and there is
currently an issue with uploading to PyPI (see #52).
This ups the versions for the GitHub Actions and lets the publish to
PyPI action skip existing versions since the cannot be changed after
publishing. See
https://github.com/pypa/gh-action-pypi-publish#tolerating-release-package-file-duplicates