incorrect 'git' version for GitPython==3.1.28 installed from PyPI

It looks like there's mistake in the release of GitPython 3.1.28 with respect to the version.

Here's the output I'm getting when GitPython 3.1.28 is installed (using pip3 install)

$ python3 -c 'import git; print(git.__version__)'
git

With older GitPython versions, I'm getting a proper version instead:

$ python3 -c 'import git; print(git.__version__)'
3.1.27

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