Temporarily pin ipykernel

[philippjfr]

Avoid ipython/ipykernel#1026

[codecov]

Codecov Report

Merging #4147 (54185fa) into master (c1e14aa) will increase coverage by 33.81%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #4147       +/-   ##
===========================================
+ Coverage   37.62%   71.43%   +33.81%     
===========================================
  Files         224      224               
  Lines       33382    33382               
===========================================
+ Hits        12561    23848    +11287     
+ Misses      20821     9534    -11287     

Flag	Coverage Δ
ui-tests	?
unitexamples-tests	71.43% <ø> (?)

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Impacted Files	Coverage Δ
panel/tests/ui/widgets/test_tabulator.py	9.56% <0.00%> (-89.41%)	⬇️
panel/tests/ui/widgets/test_input.py	11.34% <0.00%> (-87.60%)	⬇️
panel/tests/ui/widgets/test_sliders.py	15.42% <0.00%> (-84.58%)	⬇️
panel/tests/ui/layout/test_accordion.py	14.72% <0.00%> (-84.05%)	⬇️
panel/tests/ui/layout/test_card.py	18.01% <0.00%> (-80.19%)	⬇️
panel/tests/ui/io/test_convert.py	15.92% <0.00%> (-77.00%)	⬇️
panel/tests/ui/test_reactive.py	26.53% <0.00%> (-73.47%)	⬇️
panel/tests/ui/template/test_fastgridtemplate.py	28.57% <0.00%> (-71.43%)	⬇️
panel/tests/ui/template/test_fastlisttemplate.py	28.57% <0.00%> (-71.43%)	⬇️
panel/tests/ui/template/test_materialtemplate.py	29.62% <0.00%> (-70.38%)	⬇️
... and 164 more

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