feat(CI): Add Ruby 3.2/3.3 to the test matrix (#402)

Merge pull request 402

Author: Rotzbua

.github/workflows/ruby.yml

@@ -12,10 +12,10 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-version: ['2.6', '2.7', '3.0', '3.1']
+        ruby-version: ['2.6', '2.7', '3.0', '3.1', '3.2', '3.3']
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v4
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with: