Add Ruby 3.3 to CI matrix

Author: padde

.github/workflows/test.yml

@@ -15,6 +15,10 @@ jobs:
           - { ruby: "3.2", rails: "6.1.7", grape-swagger: "2.1.1" }
           - { ruby: "3.2", rails: "7.2.1", grape-swagger: "1.6.1" }
           - { ruby: "3.2", rails: "7.2.1", grape-swagger: "2.1.1" }
+          - { ruby: "3.3", rails: "6.1.7", grape-swagger: "1.6.1" }
+          - { ruby: "3.3", rails: "6.1.7", grape-swagger: "2.1.1" }
+          - { ruby: "3.3", rails: "7.2.1", grape-swagger: "1.6.1" }
+          - { ruby: "3.3", rails: "7.2.1", grape-swagger: "2.1.1" }
           - { ruby: "jruby-9.4.6", rails: "6.1.7", grape-swagger: "1.6.1" }
           - { ruby: "jruby-9.4.6", rails: "6.1.7", grape-swagger: "2.1.1" }
           - { ruby: "jruby-9.4.6", rails: "7.2.1", grape-swagger: "1.6.1" }