Adds Ruby 3.2 to the CI matrix. Also updates checkout action version.

Author: petergoldstein

.github/workflows/ci.yml

@@ -8,6 +8,7 @@ jobs:
           - "2.7"
           - "3.0"
           - "3.1"
+          - "3.2"
         gemfile:
           - Gemfile
           - gemfiles/rails_7_propshaft.gemfile
@@ -22,7 +23,7 @@ jobs:
       BUNDLE_GEMFILE: ${{ matrix.gemfile }}
 
     steps:
-      - uses: actions/checkout@v1
+      - uses: actions/checkout@v3
 
       - name: Install Ruby
         uses: ruby/setup-ruby@v1