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

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

Author: pre-commit-ci[bot]

packages/application/style/sidepanel.css

@@ -1,7 +1,7 @@
 /*-----------------------------------------------------------------------------
 | Copyright (c) Jupyter Development Team.
 | Distributed under the terms of the Modified BSD License.
-| 
+|
 | Adapted from JupyterLab's packages/application/style/sidepanel.css.
 |----------------------------------------------------------------------------*/