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

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

bootstrap/bootstrap.py

@@ -42,6 +42,7 @@ Command line flags, from "bootstrap.py --help":
                             can also pass a branch name such as 'main' or a
                             commit hash.
 """
+
 import logging
 import multiprocessing
 import os