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

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

integration-tests/test_install.py

@@ -1,15 +1,14 @@
-from contextlib import contextmanager
-from concurrent.futures import ProcessPoolExecutor
-from functools import partial
 import grp
 import os
 import pwd
 import subprocess
 import sys
+from concurrent.futures import ProcessPoolExecutor
+from contextlib import contextmanager
+from functools import partial
 
 import pytest
 
-
 ADMIN_GROUP = "jupyterhub-admins"
 USER_GROUP = "jupyterhub-users"
 INSTALL_PREFIX = os.environ.get("TLJH_INSTALL_PREFIX", "/opt/tljh")