chore: force express 4.21.2

Author: steve-lebleu

package.json

@@ -86,7 +86,7 @@
     "dayjs": "^1.11.13",
     "dotenv": "^16.4.7",
     "es6-promisify": "7.0.0",
-    "express": "^4.21.2",
+    "express": "4.21.2",
     "express-rate-limit": "^7.5.0",
     "filenamify": "^4.3.0",
     "helmet": "^8.0.0",