Update dependency express to v5

Author: descope[bot]

package.json

@@ -55,7 +55,7 @@
     "@descope/node-sdk": "^1.7.2",
     "cors": "^2.8.5",
     "dotenv": "^16.4.7",
-    "express": "^4.21.2",
+    "express": "^5.0.0",
     "express-rate-limit": "^7.5.0",
     "zod": "^3.24.2"
   },