Bump webpack and @angular-devkit/build-angular in /gui-js

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 5.101.2 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@v5.101.2...v5.104.1)

Updates `@angular-devkit/build-angular` from 20.3.14 to 20.3.15
- [Release notes](https://github.com/angular/angular-cli/releases)
- [Changelog](https://github.com/angular/angular-cli/blob/main/CHANGELOG.md)
- [Commits](angular/angular-cli@v20.3.14...v20.3.15)

---
updated-dependencies:
- dependency-name: webpack
  dependency-version: 5.104.1
  dependency-type: indirect
- dependency-name: "@angular-devkit/build-angular"
  dependency-version: 20.3.15
  dependency-type: direct:development
...

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Author: dependabot[bot]