Updates for client 8

[blink1073]

• Use ensure_async() where appropriate
• Fix type checking

[codecov]

Codecov Report

Base: 80.37% // Head: 80.30% // Decreases project coverage by -0.08% ⚠️

Coverage data is based on head (fc0400a) compared to base (91c5942).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1188      +/-   ##
==========================================
- Coverage   80.37%   80.30%   -0.08%     
==========================================
  Files          68       68              
  Lines        8149     8149              
  Branches     1605     1605              
==========================================
- Hits         6550     6544       -6     
- Misses       1177     1181       +4     
- Partials      422      424       +2     

Impacted Files	Coverage Δ
jupyter_server/gateway/managers.py	83.41% <100.00%> (ø)
jupyter_server/services/kernels/kernelmanager.py	81.57% <100.00%> (-0.61%)	⬇️
...ter_server/services/kernels/connection/channels.py	62.11% <0.00%> (-0.45%)	⬇️
jupyter_server/serverapp.py	79.92% <0.00%> (-0.18%)	⬇️

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