Test on 3.3 also

Author: luke-hill

.github/workflows/test-ruby.yml

@@ -17,12 +17,12 @@ jobs:
       matrix:
         os:
           - ubuntu-latest
-        ruby: ['2.7', '3.0', '3.1', '3.2']
+        ruby: ['2.7', '3.0', '3.1', '3.2', '3.3']
         include:
           - os: windows-latest
-            ruby: '3.2'
+            ruby: '3.3'
           - os: macos-latest
-            ruby: '3.2'
+            ruby: '3.3'
 
     steps:
     - uses: actions/checkout@v4