drop LSP extension (jupyter-server#349)

Author: Zsailer

deployment/requirements.txt

@@ -1,8 +1,6 @@
 data_studio_notebook_service_gateway~=0.6
 jupyterlab-geojson~=3.1.0
 jupyterlab-git~=0.32.0
-jupyterlab-lsp~=3.8
 jupyterlab-widgets~=1.0
 jupyterlab_execute_time~=2.0
 pycryptodome~=3.0.0
-python-lsp-server[all]~=1.2