Clean up version info handling

[blink1073]

No description provided.

[codecov-commenter]

Codecov Report

Merging #620 (0308229) into master (3b72d9c) will increase coverage by 0.06%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #620      +/-   ##
==========================================
+ Coverage   77.56%   77.63%   +0.06%     
==========================================
  Files         110      110              
  Lines       10404    10398       -6     
  Branches     1288     1408     +120     
==========================================
+ Hits         8070     8072       +2     
+ Misses       1934     1929       -5     
+ Partials      400      397       -3     

Impacted Files	Coverage Δ
jupyter_server/_version.py	100.00% <100.00%> (+25.00%)	⬆️
jupyter_server/services/kernels/handlers.py	62.40% <0.00%> (+1.50%)	⬆️

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