Revert benchmarking script

Author: MarkusSintonen

requirements.txt

@@ -21,8 +21,3 @@ pytest==8.2.0
 pytest-httpbin==2.0.0
 pytest-trio==0.8.0
 werkzeug<2.1  # See: https://github.com/psf/httpbin/issues/35
-
-# Benchmarking and profiling
-aiohttp==3.9.5
-matplotlib==3.9.0
-pyinstrument==4.6.2