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

Bumps [webpack](https://github.com/webpack/webpack) to 5.76.1 and updates ancestor dependency [@angular-devkit/build-angular](https://github.com/angular/angular-cli). These dependencies need to be updated together.


Updates `webpack` from 5.75.0 to 5.76.1
- [Release notes](https://github.com/webpack/webpack/releases)
- [Commits](webpack/webpack@v5.75.0...v5.76.1)

Updates `@angular-devkit/build-angular` from 15.0.5 to 15.2.4
- [Release notes](https://github.com/angular/angular-cli/releases)
- [Changelog](https://github.com/angular/angular-cli/blob/main/CHANGELOG.md)
- [Commits](angular/angular-cli@15.0.5...15.2.4)

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

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Author: dependabot[bot]