Add ruby 3.3 to CI

.github/workflows/test.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: [3.0, 3.1, 3.2, head]
+        ruby: [3.0, 3.1, 3.2, 3.3, head]
 
     steps:
       - uses: actions/checkout@v2