fix: inline isDynamicRoute to avoid sls-next issues

Author: lindsaylevine

lib/helpers/isDynamicRoute.js

@@ -1,6 +1,6 @@
 // Return true if the route uses dynamic routing (e.g., [id] or [...slug])
-const {
-  default: isDynamicRoute,
-} = require("@sls-next/lambda-at-edge/dist/lib/isDynamicRoute");
+const isDynamicRoute = (route) => {
+  return /\/\[[^\/]+?](?=\/|$)/.test(route);
+};
 
 module.exports = isDynamicRoute;