Bump @angular/platform-server in /src/Web/WebSPA/Client

Bumps [@angular/platform-server](https://github.com/angular/angular/tree/HEAD/packages/platform-server) from 20.3.13 to 21.0.2.
- [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/21.0.2/packages/platform-server)

---
updated-dependencies:
- dependency-name: "@angular/platform-server"
  dependency-version: 21.0.2
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

src/Web/WebSPA/Client/package.json

@@ -35,7 +35,7 @@
     "@angular/localize": "20.3.13",
     "@angular/platform-browser": "20.3.13",
     "@angular/platform-browser-dynamic": "20.3.13",
-    "@angular/platform-server": "20.3.13",
+    "@angular/platform-server": "21.0.2",
     "@angular/router": "20.3.13",
     "@microsoft/signalr": "10.0.0",
     "@ng-bootstrap/ng-bootstrap": "19.0.1",