fix: change import path for goldmark-jupyter

[bevzzz]

This could be a breaking change, but afaik nobody uses this package atm.
Also, goldmark-jupyter does not do semver, so I'm making it a simple fix instead.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (cab939a) 82.13% compared to head (86081ef) 82.13%.

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Additional details and impacted files

@@           Coverage Diff           @@
##             main       #9   +/-   ##
=======================================
  Coverage   82.13%   82.13%           
=======================================
  Files          11       11           
  Lines         571      571           
=======================================
  Hits          469      469           
  Misses         81       81           
  Partials       21       21           

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