mgr/dashboard: bump vite and @angular-devkit/build-angular

mgr/dashboard: bump vite and @angular-devkit/build-angular

Removes [vite](https://github.com/vitejs/vite/tree/HEAD/packages/vite). It's no longer used after updating ancestor dependency [@angular-devkit/build-angular](https://github.com/angular/angular-cli). These dependencies need to be updated together.

Removes `vite`

Updates `@angular-devkit/build-angular` from 18.2.11 to 18.2.20
- [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...18.2.20)

---
updated-dependencies:
- dependency-name: vite
  dependency-version:
  dependency-type: indirect
- dependency-name: "@angular-devkit/build-angular"
  dependency-version: 18.2.20
  dependency-type: direct:development
...

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