fix: upgrade multiple dependencies with Snyk

Snyk has created this PR to upgrade:
  - express from 4.18.2 to 4.19.2.
    See this package in npm: https://www.npmjs.com/package/express
  - ts-node from 10.9.1 to 10.9.2.
    See this package in npm: https://www.npmjs.com/package/ts-node

See this project in Snyk:
https://app.snyk.io/org/sammytezzy/project/3cf70123-b9bb-422a-b70f-76eff3f8756b?utm_source=github&utm_medium=referral&page=upgrade-pr

Author: snyk-bot

tools/challenge-editor/api/package.json

@@ -11,9 +11,9 @@
   "license": "BSD-3-Clause",
   "dependencies": {
     "cors": "2.8.5",
-    "express": "4.18.2",
+    "express": "4.19.2",
     "gray-matter": "4.0.3",
-    "ts-node": "10.9.1"
+    "ts-node": "10.9.2"
   },
   "devDependencies": {
     "@types/cors": "^2.8.13",