Add dependabot config

[FlxPo]

Motivations

Make dependabot analyze pyproject.toml, not pinned requirements files.

Changes

Added a .github/dependabot.yaml config file.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 58.92%. Comparing base (deaf5e9) to head (c143197).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #278   +/-   ##
=======================================
  Coverage   58.92%   58.92%           
=======================================
  Files         128      128           
  Lines        6715     6715           
=======================================
  Hits         3957     3957           
  Misses       2758     2758           

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