Add ruby 3.4 to test matrix

Author: teeparham

.github/workflows/test.yml

@@ -6,7 +6,7 @@ jobs:
     continue-on-error: ${{ matrix.flaky }}
     strategy:
       matrix:
-        ruby-version: ["3.0", "3.1", "3.2", "3.3", "jruby-9.4"]
+        ruby-version: ["3.0", "3.1", "3.2", "3.3", "3.4", "jruby-9.4"]
         flaky: [false]
         include:
           - ruby-version: "ruby-head"