Set up ruby and rubygems different for ruby 2.5

Author: eikes

.github/workflows/ci.yml

@@ -44,6 +44,13 @@ jobs:
       - uses: actions/checkout@v3
       - name: Set up Ruby ${{ matrix.ruby }}
         uses: ruby/setup-ruby@v1
+        if: matrix.ruby == '2.5'
+        with:
+          ruby-version: ${{ matrix.ruby }}
+          bundler-cache: true # 'bundle install' and cache
+      - name: Set up Ruby ${{ matrix.ruby }}
+        uses: ruby/setup-ruby@v1
+        if: matrix.ruby != '2.5'
         with:
           ruby-version: ${{ matrix.ruby }}
           bundler-cache: true # 'bundle install' and cache