Fix Server Version Handling and Clean up CI

[blink1073]

cf jupyter-server/jupyter_server#1134

[codecov]

Codecov Report

Base: 82.57% // Head: 85.52% // Increases project coverage by +2.95% 🎉

Coverage data is based on head (7d6b581) compared to base (2a489a8).
Patch coverage: 82.35% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #71      +/-   ##
==========================================
+ Coverage   82.57%   85.52%   +2.95%     
==========================================
  Files           7        7              
  Lines         241      228      -13     
  Branches       37       38       +1     
==========================================
- Hits          199      195       -4     
+ Misses         33       23      -10     
- Partials        9       10       +1     

Impacted Files	Coverage Δ
jupyter_server_terminals/__init__.py	50.00% <40.00%> (ø)
jupyter_server_terminals/api_handlers.py	100.00% <100.00%> (+3.84%)	⬆️
jupyter_server_terminals/app.py	75.51% <100.00%> (+2.43%)	⬆️
jupyter_server_terminals/base.py	100.00% <100.00%> (+25.00%)	⬆️
jupyter_server_terminals/handlers.py	77.77% <100.00%> (+3.41%)	⬆️
jupyter_server_terminals/terminalmanager.py	88.75% <100.00%> (+2.00%)	⬆️

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