Add 3.4 to the matrix.

Author: djberg96

.github/workflows/ruby.yml

@@ -15,7 +15,7 @@ jobs:
   test:
     strategy:
       matrix:
-        ruby-version: ['2.7', '3.0', '3.1', '3.2', '3.3', 'truffleruby', 'jruby']
+        ruby-version: ['2.7', '3.0', '3.1', '3.2', '3.3', '3.4', 'truffleruby', 'jruby']
         platform: [ubuntu-latest, macos-latest, windows-latest]
         exclude:
           - ruby-version: truffleruby