Update CI test matrix

Author: arashm

.github/workflows/ruby.yml

@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        ruby-version: ["3.0", "3.1", "3.2", "3.3"]
+        ruby-version: ["3.2", "3.3", "3.4", "4.0"]
 
     steps:
       - uses: actions/checkout@v2