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

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

voila/server_extension.py

@@ -19,7 +19,7 @@
 
 from .configuration import VoilaConfiguration
 from .tornado.handler import TornadoVoilaHandler
-from .paths import ROOT, collect_static_paths, collect_template_paths, jupyter_path
+from .paths import ROOT, collect_static_paths, collect_template_paths
 from .shutdown_kernel_handler import VoilaShutdownKernelHandler
 from .static_file_handler import (
     MultiStaticFileHandler,