Switch to ruby 3.4 from rc

Author: JonRowe

.github/workflows/ci.yml

@@ -37,6 +37,9 @@ jobs:
       matrix:
        include:
          # Edge Rails (?) builds >= 3.1
+         - ruby: 3.4
+           env:
+             RAILS_VERSION: 'main'
          - ruby: 3.3
            env:
              RAILS_VERSION: 'main'
@@ -45,7 +48,7 @@ jobs:
              RAILS_VERSION: 'main'
 
          # Rails 8.0 builds >= 3.2
-         - ruby: 3.4.0-rc1
+         - ruby: 3.4
            env:
              RAILS_VERSION: '~> 8.0.0'
          - ruby: 3.3