Add Ruby 3.2 to CI.

Author: petergoldstein

.github/workflows/ruby.yml

@@ -14,7 +14,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest]
-        ruby: ['2.6', '2.7', '3.0', '3.1']
+        ruby: ['2.6', '2.7', '3.0', '3.1', '3.2']
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v3