ci(deps): auto-approve / auto-merge dependencies from dependabot

[mwbrooks]

Summary

Add a GitHub Actions workflow to auto-approve and auto-merge Dependabot pull requests for patch and minor version updates.

This reduces maintenance burden by automatically handling low-risk dependency updates while still requiring manual review for major version bumps.

Repository Settings Required

To enable auto-merge functionality, the following repository settings must be configured:

• Settings → General → Pull Requests

  • ✅ Allow auto-merge

• Settings → Branches → main branch protection rule

  • ✅ Require status checks to pass before merging
    • Add required checks: Build, Unit Tests

• Settings → Actions → General → Workflow permissions

  • ✅ Allow GitHub Actions to create and approve pull requests

Requirements (place an x in each [ ])

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[zimeg]

LGTM - clean dependabot auto-merge workflow

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.38%. Comparing base (dbef5e4) to head (5e42a77).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #1554      +/-   ##
============================================
+ Coverage     73.36%   73.38%   +0.02%     
  Complexity     4515     4515              
============================================
  Files           477      477              
  Lines         14274    14274              
  Branches       1487     1487              
============================================
+ Hits          10472    10475       +3     
+ Misses         2910     2908       -2     
+ Partials        892      891       -1     

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[mwbrooks]

Thanks for the approval @zimeg!

Everything was configured correctly on this repo (of course!)