Remove unused dependabot configuration

[chmodas]

The dependency versions are unpinned ranges, so automated version bumps add no value.

[codecov-commenter]

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.53%. Comparing base (261f6b0) to head (8c1b4f0).
⚠️ Report is 1 commits behind head on trunk.
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Additional details and impacted files

@@           Coverage Diff           @@
##            trunk      #33   +/-   ##
=======================================
  Coverage   98.53%   98.53%           
=======================================
  Files           6        6           
  Lines         342      342           
=======================================
  Hits          337      337           
  Misses          5        5           

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