test with ruby 3.4

Author: DannyBen

.github/workflows/test.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
 
     strategy:
-      matrix: { ruby: ['3.1', '3.2', '3.3'] }
+      matrix: { ruby: ['3.1', '3.2', '3.3', '3.4'] }
 
     steps:
     - name: Checkout code

.rubocop.yml

@@ -14,6 +14,7 @@ inherit_mode:
 
 AllCops:
   TargetRubyVersion: 3.1
+  SuggestExtensions: false
   Include:
     - '**/runfile'
     - '**/*.runfile'