Adds Ruby 3.2 to CI. Updates checkout action version.

.github/workflows/main.yml

@@ -21,11 +21,11 @@ jobs:
         # removing jruby again to flaky
         # ruby: [2.3, 2.4, 2.5, 2.6, 2.7, "3.0", "3.1", jruby]
         # need to add support for multiple gemfiles
-        ruby: ["2.7", "3.0", "3.1"]
+        ruby: ["2.7", "3.0", "3.1", "3.2"]
         redis-version: [4, 5, 6]
     runs-on: ${{ matrix.os }}-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v3
       - uses: supercharge/redis-github-action@1.2.0
       - uses: ruby/setup-ruby@v1
         with: