tox-uv is not needed to run tests in our environment.

--- marshmallow-4.3.1/tox.ini.orig
+++ marshmallow-4.3.1/tox.ini
@@ -1,9 +1,7 @@
 [tox]
-requires = tox-uv
 envlist = lint,mypy,py{310,311,312,313,314},docs
 
 [testenv]
-runner = uv-venv-lock-runner
 dependency_groups = tests
 commands = pytest {posargs}