Test on Ruby 4.0

Author: janko

.github/workflows/ci.yml

@@ -23,7 +23,8 @@ jobs:
           - "3.2"
           - "3.3"
           - "3.4"
-          - "jruby-9.4"
+          - "4.0"
+          - "jruby-10.0"
 
     steps:
       - uses: actions/checkout@v4