Update contributing guide and CI workflows

[sappelhoff]

PR Description

Merge Checklist

• the PR has been reviewed and all comments are resolved
• all CI checks pass
• (if applicable): the PR description includes the phrase closes #<issue-number> to automatically close an issue
• (if applicable): the changes are documented in the changelog changelog.rst
• (if applicable): new contributors have added themselves to the authors list in the CITATION.cff file

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.60%. Comparing base (9d3f984) to head (088542b).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #162   +/-   ##
=======================================
  Coverage   98.60%   98.60%           
=======================================
  Files           7        7           
  Lines         715      715           
=======================================
  Hits          705      705           
  Misses         10       10           

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