Use pandoc>=3.0 in the tests

[mwouts]

Closes #1006

[github-actions]

Thank you for making this pull request.

Did you know? You can try it on Binder: or .

Also, the version of Jupytext developed in this PR can be installed with pip:

pip install git+https://github.com/mwouts/jupytext.git@pandoc_314

(this requires nodejs, see more at Developing Jupytext)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.75%. Comparing base (f33e519) to head (67213f7).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1177   +/-   ##
=======================================
  Coverage   97.75%   97.75%           
=======================================
  Files          29       29           
  Lines        4460     4463    +3     
=======================================
+ Hits         4360     4363    +3     
  Misses        100      100           

Flag	Coverage Δ
external	75.02% <83.33%> (-0.13%)	⬇️
functional	88.48% <66.66%> (-0.02%)	⬇️
integration	77.28% <16.66%> (-0.06%)	⬇️
unit	66.55% <66.66%> (+<0.01%)	⬆️

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