DM-56158: Use monthly dependabot batches for actions

[timj]

Checklist

• ran Jenkins
• added a release note for user-visible changes to doc/changes

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.78%. Comparing base (ef82cf4) to head (8c86179).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #248   +/-   ##
=======================================
  Coverage   92.78%   92.78%           
=======================================
  Files          53       53           
  Lines        6459     6459           
  Branches      571      571           
=======================================
  Hits         5993     5993           
  Misses        366      366           
  Partials      100      100           

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