Update notebook base image

[jgwerner]

Closes #208

[codecov]

Codecov Report

Merging #209 into main will increase coverage by 1.34%.
The diff coverage is 63.88%.

@@            Coverage Diff             @@
##             main     #209      +/-   ##
==========================================
+ Coverage   77.54%   78.88%   +1.34%     
==========================================
  Files          17       18       +1     
  Lines        1140     1132       -8     
==========================================
+ Hits          884      893       +9     
+ Misses        256      239      -17     

Impacted Files	Coverage Δ
src/illumidesk/grades/handlers.py	78.57% <ø> (ø)
src/illumidesk/authenticators/validator.py	83.80% <45.00%> (-6.29%)	⬇️
src/illumidesk/spawners/hooks.py	54.54% <54.54%> (ø)
src/illumidesk/spawners/spawners.py	86.04% <76.19%> (+37.99%)	⬆️
src/illumidesk/authenticators/authenticator.py	92.39% <100.00%> (ø)
src/illumidesk/authenticators/utils.py	97.36% <100.00%> (ø)

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[netoisc]

LGTM