[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

@@ -4,6 +4,7 @@
 Read https://prometheus.io/docs/practices/naming/ for naming
 conventions for metrics & labels.
 """
+
 # Do this to see if we end up in an import loop?
 from notebook.prometheus.metrics import (
     HTTP_REQUEST_DURATION_SECONDS,