Add Ruby 3.4 to CI matrix

Author: amorde

.github/workflows/Specs.yml

@@ -14,7 +14,7 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: ['2.7', '3.0', '3.1', '3.2', '3.3']
+        ruby: ['2.7', '3.0', '3.1', '3.2', '3.3', '3.4']
         os: [ubuntu-24.04]
         include:
           - os: macos-14