Bump amphp/http from 2.1.0 to 2.1.1 (#72)

Bumps [amphp/http](https://github.com/amphp/http) from 2.1.0 to 2.1.1.
- [Release notes](https://github.com/amphp/http/releases)
- [Commits](amphp/http@v2.1.0...v2.1.1)

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

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