Adjusting migration version in Readme and compat test.

Author: RobinTail

compat-test/eslint.config.js

@@ -3,5 +3,5 @@ import migration from "@express-zod-api/migration";
 
 export default [
   { languageOptions: { parser }, plugins: { migration } },
-  { files: ["**/*.ts"], rules: { "migration/v26": "error" } },
+  { files: ["**/*.ts"], rules: { "migration/v27": "error" } },
 ];

migration/README.md

@@ -18,6 +18,6 @@ import migration from "@express-zod-api/migration";
 
 export default [
   { languageOptions: { parser }, plugins: { migration } },
-  { files: ["**/*.ts"], rules: { "migration/v26": "error" } },
+  { files: ["**/*.ts"], rules: { "migration/v27": "error" } },
 ];
 ```