infra(renovate): reduce update frequency to monthly

[ST-DDT]

Fixes #3077

• Reduce frequency of dependency update PRs #3077

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It looks like most team members are busy with other tasks, so we should reduce the frequency of dependency updates to avoid notification spam.A list of available updates is still available in the dependency dashboard issue.

This PR set the dependency update schedule to monthly (1st each month).

Alternative solutions:

• Set prCreation to 'approval' (via dependency dashboard checkbox)

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.95%. Comparing base (8bceb58) to head (25f6e1f).
Report is 1 commits behind head on next.

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #3217      +/-   ##
==========================================
- Coverage   99.96%   99.95%   -0.01%     
==========================================
  Files        2804     2804              
  Lines      216974   216974              
  Branches      962      577     -385     
==========================================
- Hits       216894   216887       -7     
- Misses         80       87       +7     

see 2 files with indirect coverage changes

[ST-DDT]

Team Decision

Faker only has dev dependencies, so updates aren't critical to our users.
With our current release frequency it is sufficient to do the updates before we release.
We stick to monthly updates to get notified of breaking changes frequently/monthly.