Bump @angular/core from 9.1.9 to 10.2.5 in /frontend

Bumps [@angular/core](https://github.com/angular/angular/tree/HEAD/packages/core) from 9.1.9 to 10.2.5.
- [Release notes](https://github.com/angular/angular/releases)
- [Changelog](https://github.com/angular/angular/blob/10.2.5/CHANGELOG.md)
- [Commits](https://github.com/angular/angular/commits/10.2.5/packages/core)

---
updated-dependencies:
- dependency-name: "@angular/core"
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

frontend/package.json

@@ -20,7 +20,7 @@
   "private": true,
   "dependencies": {
     "@angular/common": "~9.1.9",
-    "@angular/core": "~9.1.9",
+    "@angular/core": "~10.2.5",
     "@angular/forms": "~9.1.9",
     "@angular/platform-browser": "~9.1.9",
     "@angular/platform-browser-dynamic": "~9.1.9",