chore: [Snyk] Security upgrade express from 4.19.2 to 4.21.0 in system-tests (#30227)

* fix: system-tests/projects/v8-snapshot/example-express/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-BODYPARSER-7926860
- https://snyk.io/vuln/SNYK-JS-EXPRESS-7926867
- https://snyk.io/vuln/SNYK-JS-SEND-7926862
- https://snyk.io/vuln/SNYK-JS-SERVESTATIC-7926865

* yarn lock

* Update express.spec.ts

* Update express.spec.ts

* update express

---------

Co-authored-by: snyk-bot <[email protected]>
Co-authored-by: Ryan Manuel <[email protected]>

Author: 3 people

system-tests/projects/v8-snapshot/example-express/package.json

@@ -14,7 +14,7 @@
     "uninstall-snapshot": "DEBUG='(packherd|snapgen):*' node ./snapshot/uninstall-snapshot.js"
   },
   "dependencies": {
-    "express": "^4.17.1"
+    "express": "^4.21.0"
   },
   "license": "MIT"
 }