Bump http-cache-semantics and webpack-cli

Removes [http-cache-semantics](https://github.com/kornelski/http-cache-semantics). It's no longer used after updating ancestor dependency [webpack-cli](https://github.com/webpack/webpack-cli). These dependencies need to be updated together.


Removes `http-cache-semantics`

Updates `webpack-cli` from 2.1.4 to 5.0.1
- [Release notes](https://github.com/webpack/webpack-cli/releases)
- [Changelog](https://github.com/webpack/webpack-cli/blob/master/CHANGELOG.md)
- [Commits](https://github.com/webpack/webpack-cli/compare/[email protected])

---
updated-dependencies:
- dependency-name: http-cache-semantics
  dependency-type: indirect
- dependency-name: webpack-cli
  dependency-type: direct:development
...

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

Author: dependabot[bot]