Bump @angular/language-service in /src/Web/WebSPA/Client

Bumps [@angular/language-service](https://github.com/angular/angular/tree/HEAD/packages/language-service) from 19.2.15 to 21.0.0.
- [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/21.0.0/packages/language-service)

---
updated-dependencies:
- dependency-name: "@angular/language-service"
  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-lock.json

@@ -52,7 +52,7 @@
     "@angular-devkit/build-angular": "^19.2.15",
     "@angular/cli": "19.2.15",
     "@angular/compiler-cli": "19.2.15",
-    "@angular/language-service": "19.2.15",
+    "@angular/language-service": "21.0.0",
     "@types/jasmine": "^5.1.4",
     "@types/node": "^22.10.5",
     "eslint": "^9.17.0",