Add Ruby 3.4 and 4.0 to the Test Matrix

Author: ebaranowski

.github/workflows/ci.yml

@@ -10,7 +10,7 @@ jobs:
           - 6379:6379
     strategy:
       matrix:
-        ruby-version: ['3.3', '3.2', '3.1', '3.0', '2.7']
+        ruby-version: ['4.0', '3.4', '3.3', '3.2', '3.1', '3.0', '2.7']
 
     steps:
       - uses: actions/checkout@v2