Bump jupyter_server dependency

[afshin]

No description provided.

[codecov-commenter]

Codecov Report

Merging #126 into master will increase coverage by 0.05%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #126      +/-   ##
==========================================
+ Coverage   59.17%   59.22%   +0.05%     
==========================================
  Files          20       20              
  Lines        1575     1577       +2     
==========================================
+ Hits          932      934       +2     
  Misses        643      643              

Impacted Files	Coverage Δ
jupyterlab_server/_version.py	0.00% <0.00%> (ø)
jupyterlab_server/settings_handler.py	73.83% <ø> (ø)
jupyterlab_server/tests/test_settings_api.py	100.00% <100.00%> (ø)

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