Bump @angular/core in /src/SampleApps/SampleApp.Angular/ClientApp

Bumps [@angular/core](https://github.com/angular/angular/tree/HEAD/packages/core) from 20.3.15 to 20.3.16.
- [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/v20.3.16/packages/core)

---
updated-dependencies:
- dependency-name: "@angular/core"
  dependency-version: 20.3.16
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]