Clean up license

[dcsaba89]

@blink1073, same change as the below PRs for jupyter-client for which now the package's license is perfectly recognized by github as well

jupyter/jupyter_client#934

please approve

[codecov]

Codecov Report

Base: 79.27% // Head: 80.53% // Increases project coverage by +1.26% 🎉

Coverage data is based on head (dbaf431) compared to base (83f03e3).
Patch has no changes to coverable lines.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1218      +/-   ##
==========================================
+ Coverage   79.27%   80.53%   +1.26%     
==========================================
  Files          68       68              
  Lines        8134     8134              
  Branches     1586     1586              
==========================================
+ Hits         6448     6551     +103     
+ Misses       1273     1169     -104     
- Partials      413      414       +1     

Impacted Files	Coverage Δ
...ter_server/services/kernels/connection/channels.py	62.83% <0.00%> (-0.23%)	⬇️
jupyter_server/base/handlers.py	78.82% <0.00%> (+0.58%)	⬆️
jupyter_server/utils.py	85.46% <0.00%> (+5.81%)	⬆️
jupyter_server/serverapp.py	79.96% <0.00%> (+7.80%)	⬆️
jupyter_server/services/shutdown.py	100.00% <0.00%> (+23.07%)	⬆️

Help us with your feedback. Take ten seconds to tell us how you rate us. Have a feature suggestion? Share it here.

☔ View full report at Codecov.
📢 Do you have feedback about the report comment? Let us know in this issue.

[blink1073]

Thank you!