Update Ruby versions in CI matrix

Author: Envek

.github/workflows/test.yml

@@ -18,16 +18,14 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - ruby:  "3.1"
+          - ruby:  "3.2"
             rails: "HEAD"
-          - ruby:  "3.0"
+          - ruby:  "3.1"
             rails: "7.0"
-          - ruby:  "2.7"
+          - ruby:  "3.0"
             rails: "6.1"
-          - ruby:  "2.6"
+          - ruby:  "2.7"
             rails: "6.0"
-          - ruby:  "2.5"
-            rails: "5.2"
     container:
       image: ruby:${{ matrix.ruby }}
       env:
@@ -42,8 +40,6 @@ jobs:
           restore-keys: |
             bundle-${{ matrix.ruby }}-${{ hashFiles('**/*.gemspec') }}-${{ hashFiles('**/Gemfile') }}
             bundle-${{ matrix.ruby }}-
-      - name: Upgrade Bundler to 2.0 (for older Rubies)
-        run: gem install bundler -v '~> 2.0'
       - name: Bundle install
         run: |
           bundle config path vendor/bundle