Bump httpx from 0.16.1 to 0.17.0 in /integration_tests

Bumps [httpx](https://github.com/encode/httpx) from 0.16.1 to 0.17.0.
- [Release notes](https://github.com/encode/httpx/releases)
- [Changelog](https://github.com/encode/httpx/blob/master/CHANGELOG.md)
- [Commits](encode/httpx@0.16.1...0.17.0)

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

Author: dependabot[bot]