Adds Ruby 3.2 to the CI matrix.

Author: petergoldstein

.github/workflows/build.yml

@@ -7,10 +7,10 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: [ '2.6', '2.7', '3.0', '3.1' ]
+        ruby: [ '2.6', '2.7', '3.0', '3.1', '3.2' ]
 
     steps:
-    - uses: actions/checkout@v2
+    - uses: actions/checkout@v3
     - name: Set up Ruby ${{ matrix.ruby }}
       uses: ruby/setup-ruby@v1
       with: