raise setuptools minimum version and remove cap

The setuptools issue introduced in 72.0.0 has been fixed in later
releases, so move our minimum past the bad release series and remove the
cap to allow newer versions.

Author: dhellmann

requirements.txt

@@ -11,7 +11,7 @@ python-pypi-mirror
 PyYAML
 requests
 resolvelib
-setuptools<72.0.0
+setuptools>=73.0.0 # https://github.com/pypa/setuptools/issues/4519
 stevedore
 tomlkit
 tqdm