Bump httptools from 0.5.0 to 0.6.0 in /platform

Bumps [httptools](https://github.com/MagicStack/httptools) from 0.5.0 to 0.6.0.
- [Release notes](https://github.com/MagicStack/httptools/releases)
- [Commits](MagicStack/httptools@v0.5.0...v0.6.0)

---
updated-dependencies:
- dependency-name: httptools
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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