Update actions and add dependabot config

[rettinghaus]

This PR updates the used GH actions in the CI and add a dependabot config for future updates of those.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.1%. Comparing base (4e9c9b3) to head (5af3981).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@          Coverage Diff          @@
##            main   #4206   +/-   ##
=====================================
  Coverage   95.1%   95.1%           
=====================================
  Files        326     326           
  Lines      16192   16192           
  Branches    2545    2546    +1     
=====================================
  Hits       15391   15391           
  Misses       796     796           
  Partials       5       5           

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