Switch to PyPI Trusted Publishing, remove twine

[GenevieveBuckley]

Closes https://github.com/computational-cell-analytics/micro-sam/issues/613

This PR switches to PyPI deployment with Trusted Publishing (see the announcement and how trusted publishing works). It removes twine, and also removes the need for PyPI API tokens being used as github secrets.

This PR is not sufficient on its own, we (well, probably Constantin) also need to:

• Add a trusted publisher to our existing PyPI project (or you can create a new PyPI project with a trusted publisher).
• Delete the old PyPI API tokens, from both PyPI and the GitHub repository secrets settings.

[GenevieveBuckley]

I'm marking this PR as a draft, until:

1. The url on line 70 of release_drafter.yml is fixed (see this comment), and...
2. PyPI Trusted Publishing has been enabled (see https://docs.pypi.org/trusted-publishers/adding-a-publisher/). I don't have access to do this.