Merge pull request #360 from zendesk/ruby_33

Add tests on Ruby 3.3

Author: mmassaki

.github/workflows/actions.yml

@@ -18,6 +18,7 @@ jobs:
           - '3.0'
           - '3.1'
           - '3.2'
+          - '3.3'
     steps:
       - uses: zendesk/checkout@v3
       - uses: zendesk/setup-ruby@v1