Bump webpack and @nestjs/cli in /sources/packages/backend (#1817)

Bumps [webpack](https://github.com/webpack/webpack) to 5.76.2 and updates ancestor dependency [@nestjs/cli](https://github.com/nestjs/nest-cli). These dependencies need to be updated together.


Updates `webpack` from 5.74.0 to 5.76.2
- [Release notes](https://github.com/webpack/webpack/releases)
- [Commits](webpack/webpack@v5.74.0...v5.76.2)

Updates `@nestjs/cli` from 9.1.4 to 9.3.0
- [Release notes](https://github.com/nestjs/nest-cli/releases)
- [Changelog](https://github.com/nestjs/nest-cli/blob/master/.release-it.json)
- [Commits](nestjs/nest-cli@9.1.4...9.3.0)

---
updated-dependencies:
- dependency-name: webpack
  dependency-type: indirect
- dependency-name: "@nestjs/cli"
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>