Use PyPI Trusted Publisher approach for releases

[Andy-Grigg]

Closes #598

Use Trusted Publisher instead of the previous token approach. I have defined an environment that:

• Requires approval from one other member of the maintainer team
• Only runs from a release/* branch

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.44%. Comparing base (1ab56f8) to head (914cd35).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #646   +/-   ##
=======================================
  Coverage   94.44%   94.44%           
=======================================
  Files           7        7           
  Lines         792      792           
=======================================
  Hits          748      748           
  Misses         44       44           

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