Fix a typo

[krassowski]

No description provided.

[codecov-commenter]

Codecov Report

Merging #683 (431d281) into main (65e990e) will increase coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #683      +/-   ##
==========================================
+ Coverage   77.80%   77.85%   +0.05%     
==========================================
  Files         110      110              
  Lines       10465    10465              
  Branches     1405     1405              
==========================================
+ Hits         8142     8148       +6     
+ Misses       1930     1922       -8     
- Partials      393      395       +2     

Impacted Files	Coverage Δ
jupyter_server/services/sessions/sessionmanager.py	87.50% <ø> (ø)
jupyter_server/services/kernels/kernelmanager.py	82.53% <0.00%> (+1.90%)	⬆️

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[Zsailer]

Thanks!