Skip Ruby 2.5

Author: mame

.github/workflows/test.yml

@@ -6,7 +6,7 @@ jobs:
   build:
     strategy:
       matrix:
-        ruby: [ 'head', '3.0', '2.7', '2.6', '2.5' ]
+        ruby: [ 'head', '3.0', '2.7', '2.6' ]
         os:
           - windows-latest
           - ubuntu-latest
@@ -22,7 +22,7 @@ jobs:
         ruby-version: ${{ matrix.ruby }}
         bundler-cache: true # 'bundle install' and cache
     # Avoid issues on these platforms
-    - if: ${{ matrix.ruby == '2.5' || matrix.ruby == '2.6' }}
+    - if: ${{ matrix.ruby == '2.6' }}
       run: gem update --system
     - name: Run test
       run: bundle exec rake