fix: upgrade express from 4.12.4 to 4.21.1

Snyk has created this PR to upgrade express from 4.12.4 to 4.21.1.

See this package in npm:
express

See this project in Snyk:
https://app.snyk.io/org/sandboxclonewithgitclone/project/72d8847a-091d-46c3-b37f-9a448b8f0d02?utm_source=github&utm_medium=referral&page=upgrade-pr

package.json

@@ -36,7 +36,7 @@
     "ejs": "1.0.0",
     "ejs-locals": "1.0.2",
     "errorhandler": "1.2.0",
-    "express": "4.12.4",
+    "express": "4.21.1",
     "express-fileupload": "0.0.5",
     "express-session": "^1.17.2",
     "file-type": "^8.1.0",