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

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

Author: pre-commit-ci[bot]

jupyter_server/prometheus/metrics.py

@@ -4,7 +4,8 @@
 Read https://prometheus.io/docs/practices/naming/ for naming
 conventions for metrics & labels.
 """
-from prometheus_client import Info, Gauge, Histogram
+
+from prometheus_client import Gauge, Histogram, Info
 
 try:
     from notebook._version import version_info as notebook_version_info