Use rubocop/rubocop instead of rubocop-hq/rubocop

Author: ydah

.github/workflows/main.yml

@@ -69,7 +69,7 @@ jobs:
       - uses: actions/checkout@v4
       - name: Use latest RuboCop from `master`
         run: |
-          echo "gem 'rubocop', github: 'rubocop-hq/rubocop'" > Gemfile.local
+          echo "gem 'rubocop', github: 'rubocop/rubocop'" > Gemfile.local
       - uses: ruby/setup-ruby@v1
         with:
           ruby-version: "3.3"