Fix Publish workflow

[mmschlk]

Moving from 1.3.2 to 1.4.0, the upload to pypi is semi-broken. The source files which get created are 120mb of size and include the whole GitHub repo. This is of course not desired since we want to have lightweight source on PyPI. For 1.4.0 only the wheels are on pypi: Files.

Goal:

• the tar.gz should only include shapiq and shapiq-games and the standard project-metadata like LICENSE and readme and so on.

I tried fixing it locally but were not easily able to do so and would need to take another look.

[mmschlk]

It's probably setuptools_scm adding all git tracked files: https://setuptools.pypa.io/en/latest/userguide/miscellaneous.html#using-manifest-in

Thanks, @Cortys