Bump webpack-dev-middleware and ngx-build-plus in /core (#199)

Bumps [webpack-dev-middleware](https://github.com/webpack/webpack-dev-middleware) to 6.1.2 and updates ancestor dependency [ngx-build-plus](https://github.com/manfredsteyer/ngx-build-plus). These dependencies need to be updated together.


Updates `webpack-dev-middleware` from 5.3.3 to 6.1.2
- [Release notes](https://github.com/webpack/webpack-dev-middleware/releases)
- [Changelog](https://github.com/webpack/webpack-dev-middleware/blob/v6.1.2/CHANGELOG.md)
- [Commits](webpack/webpack-dev-middleware@v5.3.3...v6.1.2)

Updates `ngx-build-plus` from 13.0.1 to 17.0.0
- [Release notes](https://github.com/manfredsteyer/ngx-build-plus/releases)
- [Commits](https://github.com/manfredsteyer/ngx-build-plus/commits)

---
updated-dependencies:
- dependency-name: webpack-dev-middleware
  dependency-type: indirect
- dependency-name: ngx-build-plus
  dependency-type: direct:development
...

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Author: dependabot[bot]