Add Ruby 3.3 to CI matrix (#529)

Author: m-nakamura145

.github/workflows/test.yml

@@ -88,6 +88,7 @@ jobs:
           - '3.0'
           - 3.1
           - 3.2
+          - 3.3
           - jruby-9.1
           - jruby-9.2
           - jruby-9.3