fix: Remove .github special case

[ianlewis]

Description:

Remove .github as a special case for vendoring.

Related Issues:

N/A

Checklist:

• Review the CONTRIBUTING.md documentation.
• Add a reference to a related issue in the repository.
• Add a description of the changes proposed in the pull request.
• Add unit tests if applicable.
• Update documentation if applicable.
• Add a note in the CHANGELOG.md if applicable.
• Sign the Google CLA.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.30%. Comparing base (996d366) to head (58b933e).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1502      +/-   ##
==========================================
+ Coverage   78.81%   81.30%   +2.49%     
==========================================
  Files          15       14       -1     
  Lines         892      690     -202     
==========================================
- Hits          703      561     -142     
+ Misses        138       81      -57     
+ Partials       51       48       -3     

Files	Coverage Δ
internal/walker/walker.go	59.83% <100.00%> (-0.53%)	⬇️

... and 9 files with indirect coverage changes