chore(deps): change dependabot interval to monthly

[bednar]

Proposed Changes

Changed dependabot interval to monthly. The security updates aren't affected by this change.

Checklist

• Rebased/mergeable
• pub run test completes successfully
• Commit messages are in semantic format
• Sign CLA (if not already signed)

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 21.00%. Comparing base (2581ea0) to head (5bbb15c).
Report is 15 commits behind head on main.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #129   +/-   ##
=======================================
  Coverage   21.00%   21.00%           
=======================================
  Files         117      117           
  Lines        7552     7552           
=======================================
  Hits         1586     1586           
  Misses       5966     5966           

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