[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

tests/test_namespace_visibility.py

@@ -1,8 +1,9 @@
 import namespace_visibility_1
 import namespace_visibility_2
-import pybind11_cross_module_tests as cm
 import pytest
 
+import pybind11_cross_module_tests as cm
+
 
 def test_namespace_visibility():
     del cm  # Unused.