Handle TimeoutError During Fixture Shutdown

[blink1073]

Fixes #39

[codecov]

Codecov Report

Base: 94.50% // Head: 94.18% // Decreases project coverage by -0.32% ⚠️

Coverage data is based on head (d83c5b6) compared to base (d6216bd).
Patch coverage: 71.42% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #40      +/-   ##
==========================================
- Coverage   94.50%   94.18%   -0.33%     
==========================================
  Files          12       12              
  Lines         510      516       +6     
==========================================
+ Hits          482      486       +4     
- Misses         28       30       +2     

Impacted Files	Coverage Δ
pytest_jupyter/jupyter_server.py	92.51% <50.00%> (-0.71%)	⬇️
tests/test_jupyter_server.py	100.00% <100.00%> (ø)

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[blink1073]

So it looks like the issue isn't caused by this library, but we can handle the timeout if it does happen.