remove all ruby 2 version from ci matrix

.github/workflows/ci.yml

@@ -12,54 +12,19 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ['2.7', '3.0', '3.1', '3.2', jruby-head, ruby-head]
+        ruby: ['3.0', '3.1', '3.2', jruby-head, ruby-head]
         rails_version:
           - '6.0.0'
           - '6.1.0'
           - '7.0.0'
           - 'edge'
         include:
-          # Rails 5.2
-          - ruby: 2.6
-            rails_version: '5.2.0'
-          - ruby: 2.7
-            rails_version: '5.2.0'
-          - ruby: jruby-9.2
-            rails_version: '5.2.0'
-
-          # Ruby 2.6
-          - ruby: 2.6
-            rails_version: '6.0.0'
-          - ruby: 2.6
-            rails_version: '6.1.0'
-
-          # jruby-9.2
-          - ruby: jruby-9.2
-            rails_version: '6.0.0'
-          - ruby: jruby-9.2
-            rails_version: '6.1.0'
-
           # jruby-9.4
           - ruby: jruby-9.4
             rails_version: '7.0.0'
           - ruby: jruby-9.4
             rails_version: 'edge'
 
-          #
-          # The past
-          #
-          # EOL Active Record
-          - ruby: 2.2
-            rails_version: '3.2.0'
-          - ruby: 2.1
-            rails_version: '4.1.0'
-          - ruby: 2.4
-            rails_version: '4.2.0'
-          - ruby: 2.4
-            rails_version: '5.0.0'
-          - ruby: 2.5
-            rails_version: '5.1.0'
-
     continue-on-error: ${{ matrix.rails_version == 'edge' || endsWith(matrix.ruby, 'head') }}
 
     steps: