Merge pull request #44 from cardmagic/fix/ci-ruby-versions

Fix CI: use supported Ruby versions

Author: cardmagic

.github/workflows/ruby.yml

@@ -22,15 +22,12 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-version: ['2.7', 'head']
+        ruby-version: ['3.1', '3.2', '3.3', '3.4']
 
     steps:
     - uses: actions/checkout@v4
     - name: Set up Ruby
-    # To automatically get bug fixes and new Ruby versions for ruby/setup-ruby,
-    # change this to (see https://github.com/ruby/setup-ruby#versioning):
-    # uses: ruby/setup-ruby@v1
-      uses: ruby/setup-ruby@55283cc23133118229fd3f97f9336ee23a179fcf # v1.146.0
+      uses: ruby/setup-ruby@v1
       with:
         ruby-version: ${{ matrix.ruby-version }}
         bundler-cache: true # runs 'bundle install' and caches installed gems automatically