Update typing and warning handling

[blink1073]

For releases in jupyter_events and jupyter_client.

[codecov]

Codecov Report

Base: 80.00% // Head: 80.04% // Increases project coverage by +0.03% 🎉

Coverage data is based on head (ee93643) compared to base (39326fe).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1174      +/-   ##
==========================================
+ Coverage   80.00%   80.04%   +0.03%     
==========================================
  Files          68       68              
  Lines        8153     8153              
  Branches     1606     1606              
==========================================
+ Hits         6523     6526       +3     
+ Misses       1201     1200       -1     
+ Partials      429      427       -2     

Impacted Files	Coverage Δ
jupyter_server/services/events/handlers.py	87.93% <100.00%> (ø)
jupyter_server/serverapp.py	80.10% <0.00%> (+0.26%)	⬆️

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