Remove unnecessary dependency

The minimum version is Python 3.9 now.

Signed-off-by: Stephen Finucane <[email protected]>

Author: stephenfin

pyproject.toml

@@ -97,8 +97,7 @@ test = [
   "pytest-mock>=3.14",
   "pytest-xdist>=3.6.1",
   "re-assert>=1.1",
-  "setuptools>=75.3; python_version<='3.8'",
-  "setuptools>=75.8; python_version>'3.8'",
+  "setuptools>=75.8",
   "time-machine>=2.15; implementation_name!='pypy'",
   "wheel>=0.45.1",
 ]