Bump @angular/cli from 19.2.15 to 21.0.0 in /src/Web/WebSPA/Client

Bumps [@angular/cli](https://github.com/angular/angular-cli) from 19.2.15 to 21.0.0.
- [Release notes](https://github.com/angular/angular-cli/releases)
- [Changelog](https://github.com/angular/angular-cli/blob/main/CHANGELOG.md)
- [Commits](angular/angular-cli@19.2.15...21.0.0)

---
updated-dependencies:
- dependency-name: "@angular/cli"
  dependency-version: 21.0.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]