fix: force express version

Author: steve-lebleu

package.json

@@ -86,7 +86,7 @@
     "dayjs": "^1.11.10",
     "dotenv": "^16.4.1",
     "es6-promisify": "7.0.0",
-    "express": "^4.18.2",
+    "express": "4.18.2",
     "express-rate-limit": "5.5.1",
     "filenamify": "4.2.0",
     "helmet": "4.6.0",