fix: exercises/udacity-c2-frontend/package.json to reduce vulnerabilities

The following vulnerabilities are fixed with an upgrade:
- https://snyk.io/vuln/SNYK-JS-ANGULARCOMMON-14135651

Author: snyk-bot

exercises/udacity-c2-frontend/package.json

@@ -13,7 +13,7 @@
   },
   "private": true,
   "dependencies": {
-    "@angular/common": "^7.2.15",
+    "@angular/common": "^19.2.16",
     "@angular/core": "^7.2.15",
     "@angular/forms": "^7.2.15",
     "@angular/http": "^7.2.15",