Remove setuptools from vendored packages

Switch patchwheel test to use uv backend instead.

Follow up to #4830

Author: denik

libs/patchwheel/patch_test.go

@@ -65,10 +65,6 @@ func minimalPythonProject() map[string]string {
 name = "myproj"
 version = "0.1.0"
 
-[build-system]
-requires = ["setuptools>=61.0.0"]
-build-backend = "setuptools.build_meta"
-
 [tool.setuptools.packages.find]
 where = ["src"]
 `,