Update .rubocop.yml

Source file https://github.com/dry-rb/template-gem/blob/24c4cef75d162c008deb44c22d22988da318f340/.rubocop.yml

Author: File Sync

.rubocop.yml

@@ -4,6 +4,7 @@ AllCops:
   TargetRubyVersion: 3.0
   NewCops: disable
   Exclude:
+    - "**/vendor/**/*" # For GitHub Actions, see rubocop/rubocop#9832
     - benchmarks/*.rb
     - spec/support/coverage.rb
     - spec/support/warnings.rb