MAINT: Switch to setuptools_scm for version

[larsoner]

1. Remove old release file (didn't work, tried to install Python 3.1)
2. Hopefully fix permissions with new release method (it failed even after I enabled it on PyPI, I suspect we needed these two lines) -- @tsbinns wherever you based your code off of we should maybe fix theirs, too
3. Switch to setuptools_scm rather than bumping version numbers manually

[larsoner]

@tsbinns can you review and approve if you're happy? Then I'll mark for merge-when-green.

[tsbinns]

Hopefully fix permissions with new release method (it failed even after I enabled it on PyPI, I suspect we needed these two lines) -- @tsbinns wherever you based your code off of we should maybe fix theirs, too

@larsoner Came from mne-bids-pipeline: https://github.com/mne-tools/mne-bids-pipeline/blob/main/.github/workflows/release.yml
Want me to submit a PR there or would you just change it?

[larsoner]

Feel free to make a PR there to add the permission line and remove the __token__ stuff, I just enabled trusted publishing for that project on PyPI as well 👍