setup.cfg: drop setuptools dependency (#187)

The setuptools dependency is not needed in this file because setuptools
will be installed from the pyproject.toml file. Since the project does
not use anything from the setuptools package, remove it as a dependency.

This fixes the following bug in Debian:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1083736

Author: gagath

setup.cfg

@@ -39,7 +39,6 @@ install_requires =
 	hid
 	milc>=1.9.0
 	pyusb
-	setuptools>=45
 	# qmk_firmware packages
 	dotty-dict
 	hjson