ci: add 3.3

Author: KazuCocoa

.github/workflows/rubocop.yml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [3.0, 3.1, 3.2]
+        ruby: [3.0, 3.1, 3.2, 3.3]
 
     runs-on: ubuntu-latest