Update changelog for 1.6.3

[blink1073]

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[codecov-commenter]

Codecov Report

Merging #484 (fe4a643) into master (2b51ee3) will increase coverage by 0.05%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #484      +/-   ##
==========================================
+ Coverage   77.69%   77.75%   +0.05%     
==========================================
  Files         106      106              
  Lines        9255     9255              
  Branches      996      996              
==========================================
+ Hits         7191     7196       +5     
+ Misses       1707     1704       -3     
+ Partials      357      355       -2     

Impacted Files	Coverage Δ
jupyter_server/services/kernels/kernelmanager.py	80.43% <0.00%> (-0.73%)	⬇️
jupyter_server/services/kernels/handlers.py	63.22% <0.00%> (+1.85%)	⬆️

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