Add jupyter-lsp to dependencies list

[trungleduc]

This is a part of the ongoing effort (jupyterlab/frontends-team-compass#148, jupyter-server/team-compass#30) to support LSP in core JupyterLab.

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[codecov-commenter]

Codecov Report

Merging #282 (0fd433e) into main (9629592) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #282   +/-   ##
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  Coverage   65.20%   65.20%           
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  Files          22       22           
  Lines        1739     1739           
  Branches      296      296           
=======================================
  Hits         1134     1134           
  Misses        521      521           
  Partials       84       84           

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[fcollonval]

@trungleduc is this required? As far as I can tell it is only required in jupyterlab package with jupyterlab/jupyterlab#12534, isn't it?

[trungleduc]

Yes, to make the CI pass I added https://github.com/jupyterlab/jupyterlab/blob/2fc5419ee55f71cd1771b00dc6bd51d85b72b82c/setup.cfg#L41.
We can remove it if this PR can get in.

[fcollonval]

I would rather keep it as direct dependency of jupyterlab package than this one to be consistent. Otherwise this adds an unused dependency that will bring maintenance troubles - for instance in the future if jupyter-lsp API changes, you will need to update jupyterlab and jupyterlab-server (the latter just to bump the version constraint).

[fcollonval]

So I'm closing this one.