Fix target version for Python build

[pydsigner]

This endeavors to ensure we always have the latest go.mod to pull our Python version from. We could also do something with setuptools_scm to calculate Python version using the tags rather than looking at go.mod, but that runs the risk of getting out of sync.

[codecov-commenter]

Codecov Report

Merging #630 (d206994) into master (0474a31) will not change coverage.
Report is 1 commits behind head on master.
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@@           Coverage Diff           @@
##           master     #630   +/-   ##
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  Lines        6773     6773           
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  Misses       1021     1021           
  Partials       76       76           

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[pydsigner]

I believe this PR is ready now, everything new was working the first time except the Windows release, which is now fixed.

[tdewolff]

We might be forgetting to delete the old *.so? https://github.com/tdewolff/minify/actions/runs/6707735660/job/18228871370

[pydsigner]

We might be forgetting to delete the old *.so? https://github.com/tdewolff/minify/actions/runs/6707735660/job/18228871370

Looks like the sdist is what's erroring again. This makes sense because I updated the sdist version by changing go.mod locally and committed, so it worked one time, but I forgot to add the go get to the sdist job so the version there gets stale.