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

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

tests/child_scripts/signalprinter.py

@@ -2,8 +2,8 @@
 Print received SIGTERM & SIGINT signals
 """
 import asyncio
-import sys
 import signal
+import sys
 from functools import partial
 
 from simpervisor.atexitasync import add_handler