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]

src/Web/WebSPA/Client/package.json

@@ -51,7 +51,7 @@
   },
   "devDependencies": {
     "@angular-devkit/build-angular": "20.3.11",
-    "@angular/cli": "20.3.11",
+    "@angular/cli": "21.0.0",
     "@angular/compiler-cli": "20.3.13",
     "@angular/language-service": "20.3.13",
     "@types/jasmine": "5.1.8",