Group Dependabot updates

[gmgunter]

Use groups to combine multiple Dependabot updates into a single PR. This is a bit cleaner and sometimes required for actions that have interdependencies, like upload-artifact/download-artifact.

More details:

• https://github.blog/changelog/2023-06-30-grouped-version-updates-for-dependabot-public-beta/
• https://learn.scientific-python.org/development/guides/gha-basic/#updating
• feat: groups for dependabot scientific-python/cookie#348

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.89%. Comparing base (776f5a8) to head (4171227).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #52   +/-   ##
=======================================
  Coverage   91.89%   91.89%           
=======================================
  Files           7        7           
  Lines         395      395           
=======================================
  Hits          363      363           
  Misses         32       32           

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