Rull tilbake express (#3906)

Express 5 ødela api-et. Alle behandlingsenheter lastes inn. 


![image](https://github.com/user-attachments/assets/c52373db-5446-4a4f-b2d8-3629abaeb421)

Author: Stein-Kato

apps/api/package.json

@@ -20,7 +20,7 @@
   "dependencies": {
     "compression": "1.8.0",
     "cors": "2.8.5",
-    "express": "5.1.0",
+    "express": "4.21.2",
     "express-rate-limit": "7.5.0",
     "helmet": "8.1.0",
     "knex": "3.1.0",