ci: sync dependabot config

[charmcli]

This is an automated pull request to sync the Dependabot config with the meta repository.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 45.89%. Comparing base (04041eb) to head (a8103a7).
⚠️ Report is 17 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #39      +/-   ##
==========================================
- Coverage   46.55%   45.89%   -0.67%     
==========================================
  Files          12       12              
  Lines        1132     1181      +49     
==========================================
+ Hits          527      542      +15     
- Misses        559      591      +32     
- Partials       46       48       +2     

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