Merge pull request #1684 from sul-dlss/test-ruby4

Test on Ruby 4

Author: dnoneill

.github/workflows/ruby.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby: ["3.4"]
+        ruby: ["3.4", "4.0"]
     steps:
       - uses: actions/checkout@v6
       - name: Set up Ruby
@@ -38,7 +38,7 @@ jobs:
       - name: Set up Ruby
         uses: ruby/setup-ruby@v1
         with:
-          ruby-version: 3.3
+          ruby-version: 3.4
           bundler-cache: true
       - name: Lint Ruby files
         run: bin/rubocop --parallel