update: revert Ruby version to 3.0.0 in CI workflow and pin rubocop version

Author: FarhanAnjum-opti

.github/workflows/ruby.yml

@@ -25,14 +25,20 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: [ '3.0.1', '3.1.0', '3.2.0', '3.3.0' ]
+        ruby: [ '3.0.0', '3.1.0', '3.2.0', '3.3.0' ]
     steps:
     - uses: actions/checkout@v3
     - name: Set up Ruby ${{ matrix.ruby }}
       uses: ruby/setup-ruby@v1
       with:
         ruby-version: ${{ matrix.ruby }}
         bundler-cache: true
+    - name: Install rubocop 1.78.0 for Ruby 3.0.0
+      if: matrix.ruby == '3.0.0'
+      run: |
+        echo "Installing rubocop 1.78.0 for Ruby 3.0.0"
+        bundle add rubocop --version 1.78.0 || true
+        bundle install
     - name: Run linting
       run: |
         bundle exec rubocop