Add Ruby 3.2 to test matrix (#29)

Author: shageman

.github/workflows/ci.yml

@@ -13,6 +13,7 @@ jobs:
           # Due to https://github.com/actions/runner/issues/849, we have to use quotes for '3.0'
           - '3.0'
           - 3.1
+          - 3.2
           - head
     env:
       BUNDLE_GEMFILE: Gemfile