Bump ip and webpack-dev-server (#848)

Removes [ip](https://github.com/indutny/node-ip). It's no longer used after updating ancestor dependency [webpack-dev-server](https://github.com/webpack/webpack-dev-server). These dependencies need to be updated together.


Removes `ip`

Updates `webpack-dev-server` from 4.7.4 to 4.15.2
- [Release notes](https://github.com/webpack/webpack-dev-server/releases)
- [Changelog](https://github.com/webpack/webpack-dev-server/blob/v4.15.2/CHANGELOG.md)
- [Commits](webpack/webpack-dev-server@v4.7.4...v4.15.2)

---
updated-dependencies:
- dependency-name: ip
  dependency-type: indirect
- dependency-name: webpack-dev-server
  dependency-type: indirect
...

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