Update Ruby versions in CI

Author: peterfication

.github/workflows/ci.yml

@@ -37,9 +37,9 @@ jobs:
     strategy:
       matrix:
         include:
+          - ruby: 4.0
           - ruby: 3.4
           - ruby: 3.3
-          - ruby: 3.2
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4