Bump jupyterlab_server and jupyter_server dependencies

setup.py

@@ -147,8 +147,8 @@ setup_args['install_requires'] = [
     'tornado>=6.1.0',
     'jupyter_core',
     'jupyter_packaging~=0.7.3',
-    'jupyterlab_server~=2.2',
-    'jupyter_server~=1.2',
+    'jupyterlab_server~=2.3',
+    'jupyter_server~=1.4',
     'nbclassic~=0.2',
     'jinja2>=2.10'
 ]