Bump amphp/http from 1.6.2 to 1.7.3

Bumps [amphp/http](https://github.com/amphp/http) from 1.6.2 to 1.7.3.
- [Release notes](https://github.com/amphp/http/releases)
- [Commits](amphp/http@v1.6.2...v1.7.3)

---
updated-dependencies:
- dependency-name: amphp/http
  dependency-type: direct:production
...

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

Author: dependabot[bot]