chore: configure Dependabot for gomod and GitHub Actions

[cugu]

Updated Dependabot configuration to include gomod and github-actions ecosystems with specified limits and schedules.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 70.10%. Comparing base (e148ae0) to head (1f38312).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1168      +/-   ##
==========================================
- Coverage   70.11%   70.10%   -0.02%     
==========================================
  Files          58       58              
  Lines        8236     8236              
==========================================
- Hits         5775     5774       -1     
- Misses       2461     2462       +1     

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