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

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

Author: pre-commit-ci[bot]

src/cooler/fileops.py

@@ -1,9 +1,8 @@
 from __future__ import annotations
 
-import os
-
 # from textwrap import dedent
 import json
+import os
 import warnings
 from collections.abc import Callable
 from datetime import datetime