chore: slow down dependabot

[rvagg]

No description provided.

[Copilot]

Pull request overview

This PR reduces Dependabot update frequency for the Go module ecosystem in this repository by adjusting the schedule configuration.

Changes:

• Changed Dependabot update interval for gomod from weekly to monthly.
• Added a cooldown block intended to slow update cadence further.

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 3.83%. Comparing base (8b01cf9) to head (97962cd).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #459   +/-   ##
=======================================
  Coverage    3.83%    3.83%           
=======================================
  Files         871      871           
  Lines      172072   172072           
=======================================
  Hits         6592     6592           
  Misses     162611   162611           
  Partials     2869     2869           

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