Add Ruby 3.2 to test matrix (#337)

Author: y-yagi

.github/workflows/tests.yml

@@ -21,6 +21,7 @@ jobs:
           - 2.7
           - '3.0' # Due to https://github.com/actions/runner/issues/849, we have to use quotes for '3.0'
           - 3.1
+          - 3.2
           - jruby
           - truffleruby
     steps: