Update Ruby versions in tests

Author: xuanxu

.github/workflows/tests.yml

@@ -7,7 +7,7 @@ jobs:
     continue-on-error: ${{ matrix.failure-allowed }}
     strategy:
       matrix:
-        ruby-version: ['3.2.7', '3.3.7', '3.4.2']
+        ruby-version: ['3.2', '3.3', '3.4', '4.0']
         failure-allowed: [false]
         include:
         - ruby-version: 'truffleruby'