Clean up openapi compat and warnings

[blink1073]

No description provided.

[codecov-commenter]

Codecov Report

Base: 82.14% // Head: 81.90% // Decreases project coverage by -0.25% ⚠️

Coverage data is based on head (ed4f4b1) compared to base (6c688f6).
Patch coverage: 62.50% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #368      +/-   ##
==========================================
- Coverage   82.14%   81.90%   -0.25%     
==========================================
  Files          22       22              
  Lines        1742     1752      +10     
  Branches      330      333       +3     
==========================================
+ Hits         1431     1435       +4     
- Misses        213      216       +3     
- Partials       98      101       +3     

Impacted Files	Coverage Δ
jupyterlab_server/test_utils.py	72.51% <57.14%> (-2.69%)	⬇️
jupyterlab_server/spec.py	87.50% <100.00%> (ø)

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