support ruby 3.4 (#538)

* support ruby 3.4

* remove test

Author: mensfeld

.github/workflows/ci.yml

@@ -22,12 +22,12 @@ jobs:
       fail-fast: false
       matrix:
         ruby:
-          - '3.4.0-preview2'
+          - '3.4'
           - '3.3'
           - '3.2'
           - '3.1'
         include:
-          - ruby: '3.3'
+          - ruby: '3.4'
             coverage: 'true'
     steps:
       - uses: actions/checkout@v4