chore(deps)(deps): Bump @angular/core in /frontend

Bumps [@angular/core](https://github.com/angular/angular/tree/HEAD/packages/core) from 20.3.12 to 20.3.13.
- [Release notes](https://github.com/angular/angular/releases)
- [Changelog](https://github.com/angular/angular/blob/main/CHANGELOG.md)
- [Commits](https://github.com/angular/angular/commits/20.3.13/packages/core)

---
updated-dependencies:
- dependency-name: "@angular/core"
  dependency-version: 20.3.13
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

frontend/package-lock.json

@@ -36,7 +36,7 @@
     "@angular/cdk": "^20.2.12",
     "@angular/common": "^20.3.10",
     "@angular/compiler": "^20.3.10",
-    "@angular/core": "^20.3.10",
+    "@angular/core": "^20.3.13",
     "@angular/forms": "^20.3.12",
     "@angular/material": "^20.2.13",
     "@angular/platform-browser": "^20.3.12",