Add Ruby 3.3 to CI matrix

Author: bastelfreak

.github/workflows/ci.yml

@@ -21,6 +21,7 @@ jobs:
         ruby_version:
           - '2.7'
           - '3.2'
+          - '3.3'
     name: "spec (ruby ${{ matrix.ruby_version }})"
     uses: "puppetlabs/cat-github-actions/.github/workflows/gem_ci.yml@main"
     secrets: "inherit"
@@ -36,6 +37,7 @@ jobs:
         ruby_version:
           - '2.7'
           - '3.2'
+          - '3.3'
         include:
           - ruby_version: '2.7'
             puppet_version: '~> 7.0'