Require sphinx<8 in tests

[mwouts]

Fixes: the rst2md tests fail in the CI #1266

[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:

HATCH_BUILD_HOOKS_ENABLE=true pip install git+https://github.com/mwouts/jupytext.git@fix_rst2md_in_tests

(this requires nodejs, see more at Developing Jupytext)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.00%. Comparing base (6089897) to head (7f2f49b).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1268      +/-   ##
==========================================
+ Coverage   95.93%   97.00%   +1.07%     
==========================================
  Files          29       29              
  Lines        4476     4479       +3     
==========================================
+ Hits         4294     4345      +51     
+ Misses        182      134      -48     

Flag	Coverage Δ
external	75.02% <ø> (?)
integration	77.25% <ø> (?)
unit	66.56% <ø> (?)

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