Test with Ruby 3.4 on CI [skip ci]

Author: ankane

.github/workflows/build.yml

@@ -7,13 +7,13 @@ jobs:
       fail-fast: false
       matrix:
         include:
-          - ruby: 3.3
+          - ruby: 3.4
             os: ubuntu-24.04
           - ruby: 3.2
             os: ubuntu-22.04
           - ruby: 3.1
             os: ubuntu-20.04
-          - ruby: 3.2
+          - ruby: 3.3
             os: macos-14
           - ruby: 3.1
             os: macos-13