Merge pull request #799 from m-nakamura145/update-ci-matrix

Add Ruby 3.3 to CI matrix

Author: yahonda

.github/workflows/ci.yml

@@ -15,6 +15,7 @@ jobs:
           - "3.0"
           - "3.1"
           - "3.2"
+          - "3.3"
         include:
           - { ruby: jruby, experimental: true }
           - { ruby: jruby-head, experimental: true }