We have no big-O packaged yet.

--- zipp-3.21.0/pyproject.toml.orig
+++ zipp-3.21.0/pyproject.toml
@@ -33,7 +33,6 @@
 	"jaraco.itertools",
 	"jaraco.functools",
 	"more_itertools",
-	"big-O",
 	"pytest-ignore-flaky",
 	"jaraco.test",
 	"importlib_resources; python_version < '3.9'",