build(deps): bump cross-spawn, serve and webpack-dev-server

Bumps [cross-spawn](https://github.com/moxystudio/node-cross-spawn) to 7.0.5 and updates ancestor dependencies [cross-spawn](https://github.com/moxystudio/node-cross-spawn), [serve](https://github.com/vercel/serve) and [webpack-dev-server](https://github.com/webpack/webpack-dev-server). These dependencies need to be updated together.


Updates `cross-spawn` from 7.0.3 to 7.0.5
- [Changelog](https://github.com/moxystudio/node-cross-spawn/blob/master/CHANGELOG.md)
- [Commits](moxystudio/node-cross-spawn@v7.0.3...v7.0.5)

Updates `serve` from 12.0.0 to 14.2.4
- [Release notes](https://github.com/vercel/serve/releases)
- [Commits](vercel/serve@12.0.0...14.2.4)

Updates `webpack-dev-server` from 3.11.2 to 5.1.0
- [Release notes](https://github.com/webpack/webpack-dev-server/releases)
- [Changelog](https://github.com/webpack/webpack-dev-server/blob/master/CHANGELOG.md)
- [Commits](webpack/webpack-dev-server@v3.11.2...v5.1.0)

---
updated-dependencies:
- dependency-name: cross-spawn
  dependency-type: indirect
- dependency-name: serve
  dependency-type: direct:production
- dependency-name: webpack-dev-server
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>