Bump webpack-dev-server and @angular-devkit/build-angular

Bumps [webpack-dev-server](https://github.com/webpack/webpack-dev-server) to 5.2.1 and updates ancestor dependency [@angular-devkit/build-angular](https://github.com/angular/angular-cli). These dependencies need to be updated together.


Updates `webpack-dev-server` from 5.0.4 to 5.2.1
- [Release notes](https://github.com/webpack/webpack-dev-server/releases)
- [Changelog](https://github.com/webpack/webpack-dev-server/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack/webpack-dev-server/compare/v5.0.4...v5.2.1)

Updates `@angular-devkit/build-angular` from 18.2.11 to 20.0.1
- [Release notes](https://github.com/angular/angular-cli/releases)
- [Changelog](https://github.com/angular/angular-cli/blob/main/CHANGELOG.md)
- [Commits](https://github.com/angular/angular-cli/compare/18.2.11...20.0.1)

---
updated-dependencies:
- dependency-name: webpack-dev-server
  dependency-version: 5.2.1
  dependency-type: indirect
- dependency-name: "@angular-devkit/build-angular"
  dependency-version: 20.0.1
  dependency-type: direct:development
...

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

samples/spa-client/package.json

@@ -23,7 +23,7 @@
     "zone.js": "~0.14.10"
   },
   "devDependencies": {
-    "@angular-devkit/build-angular": "^18.2.11",
+    "@angular-devkit/build-angular": "^20.0.1",
     "@angular/cli": "^18.2.11",
     "@angular/compiler-cli": "^18.2.0",
     "@types/jasmine": "~5.1.0",