chore(deps): bump webpack and @angular-devkit/build-angular in /frontend

Bumps [webpack](https://github.com/webpack/webpack) to 5.104.1 and updates ancestor dependency [@angular-devkit/build-angular](https://github.com/angular/angular-cli). These dependencies need to be updated together.


Updates `webpack` from 5.91.0 to 5.104.1
- [Release notes](https://github.com/webpack/webpack/releases)
- [Changelog](https://github.com/webpack/webpack/blob/main/CHANGELOG.md)
- [Commits](webpack/webpack@v5.91.0...v5.104.1)

Updates `@angular-devkit/build-angular` from 18.0.2 to 21.1.2
- [Release notes](https://github.com/angular/angular-cli/releases)
- [Changelog](https://github.com/angular/angular-cli/blob/main/CHANGELOG.md)
- [Commits](angular/angular-cli@18.0.2...v21.1.2)

---
updated-dependencies:
- dependency-name: webpack
  dependency-version: 5.104.1
  dependency-type: indirect
- dependency-name: "@angular-devkit/build-angular"
  dependency-version: 21.1.2
  dependency-type: direct:production
...

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

Author: dependabot[bot]