Bump http-cache-semantics and npm

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


Removes `http-cache-semantics`

Updates `npm` from 6.13.4 to 9.6.6
- [Release notes](https://github.com/npm/cli/releases)
- [Changelog](https://github.com/npm/cli/blob/latest/CHANGELOG.md)
- [Commits](npm/cli@v6.13.4...v9.6.6)

---
updated-dependencies:
- dependency-name: http-cache-semantics
  dependency-type: indirect
- dependency-name: npm
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>