Relax version requirements of py-setuptools.

--- pyproject.toml.orig	2025-06-18 18:06:03 UTC
+++ pyproject.toml
@@ -1,5 +1,5 @@
 [build-system]
-requires = ["setuptools >= 67.7.2, < 72.0.0", "wheel >= 0.40.0"]
+requires = ["setuptools", "wheel >= 0.40.0"]
 build-backend = "setuptools.build_meta"
 
 [tool.pytest.ini_options]