Drop unused testing requirements (#473)

* Drop unused testing requirements

* Drop unused testing requirements

Author: lovelydinosaur

requirements.txt

@@ -22,13 +22,9 @@ coverage==6.2
 flake8==4.0.1
 flake8-bugbear==21.11.29
 flake8-pie==0.6.1
-hypercorn==0.12.0; python_version >= '3.7'
 isort==5.10.1
 mypy==0.910
-pproxy==2.7.8
 pytest==6.2.5
 pytest-httpbin==1.0.1
 pytest-trio==0.7.0
 pytest-asyncio==0.16.0
-trustme==0.9.0
-uvicorn==0.12.1; python_version < '3.7'