+ ci: rails 8.1

Author: palkan

.github/workflows/test.yml

@@ -40,6 +40,8 @@ jobs:
         include:
           - ruby_version: "3.4"
             rails_version: "~> 8.0.0"
+          - ruby_version: "3.4"
+            rails_version: "~> 8.1.0"
     steps:
       - uses: actions/checkout@v4
       - uses: ruby/setup-ruby@v1