fix: upgrade express from 4.17.3 to 4.21.2

Snyk has created this PR to upgrade express from 4.17.3 to 4.21.2.

See this package in npm:
express

See this project in Snyk:
https://app.snyk.io/org/sammytezzy/project/dfc1d49a-a45b-4f00-8863-6ba001f6bc14?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

examples/passport-example/package.json

@@ -4,7 +4,7 @@
   "description": "Example with Passport (http://www.passportjs.org/)",
   "dependencies": {
     "body-parser": "~1.19.0",
-    "express": "~4.17.1",
+    "express": "~4.21.2",
     "express-session": "~1.17.1",
     "passport": "~0.4.1",
     "passport-local": "~1.0.0",