Chore(deps): Bump @angular/core from 21.1.3 to 21.1.6 in /src-ui

Bumps [@angular/core](https://github.com/angular/angular/tree/HEAD/packages/core) from 21.1.3 to 21.1.6.
- [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/v21.1.6/packages/core)

---
updated-dependencies:
- dependency-name: "@angular/core"
  dependency-version: 21.1.6
  dependency-type: direct:production
...

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

src-ui/package.json

@@ -14,7 +14,7 @@
     "@angular/cdk": "^21.1.3",
     "@angular/common": "~21.1.3",
     "@angular/compiler": "~21.1.3",
-    "@angular/core": "~21.1.3",
+    "@angular/core": "~21.1.6",
     "@angular/forms": "~21.1.3",
     "@angular/localize": "~21.1.3",
     "@angular/platform-browser": "~21.1.3",