Add Rails 8.1 to CI matrix

Author: Spone

.github/workflows/ci.yml

@@ -65,6 +65,12 @@ jobs:
           - ruby_version: "3.4"
             rails_version: "8.0"
             mode: "capture_patch_enabled"
+          - ruby_version: "3.4"
+            rails_version: "8.1"
+            mode: "capture_patch_disabled"
+          - ruby_version: "3.4"
+            rails_version: "8.1"
+            mode: "capture_patch_enabled"
           - ruby_version: "3.4"
             rails_version: "main"
             mode: "capture_patch_disabled"