Uploads to test PyPi fail on sequential pushes

[ryan4984]

PyPI (and Test PyPI) requires unique version strings when uploading new packages. To ensure the packaging workflow doesn't break, every push triggers an upload to Test PyPI, however they currently fail after the first upload of a new release due to setuptools_scm not properly automatically incrementing the version. This is due to github actions only doing a shallow clone by default. A potential fix is to set the fetch depth to 0 in the github action when building the wheels/sdist for packaging (see here).