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
• make test completes successfully
• Commit messages are conventional
• Sign CLA (if not already signed)

[codecov-commenter]

Codecov Report

Patch and project coverage have no change.

Comparison is base (f72f191) 74.86% compared to head (df87c30) 74.86%.

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Additional details and impacted files

@@            Coverage Diff            @@
##             master     #147   +/-   ##
=========================================
  Coverage     74.86%   74.86%           
  Complexity      424      424           
=========================================
  Files            25       25           
  Lines          1094     1094           
=========================================
  Hits            819      819           
  Misses          275      275           

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