Use pandoc>=3.0 in the tests

[mwouts]

Closes #1006

[github-actions[bot]]

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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1177 +/- ## ======================================= Coverage 97.75% 97.75% ======================================= Files 29 29 Lines 4460 4463 +3 ======================================= + Hits 4360 4363 +3 Misses 100 100 ``` | [Flag](https://app.codecov.io/gh/mwouts/jupytext/pull/1177/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Marc+Wouts) | Coverage Δ | | |---|---|---| | [external](https://app.codecov.io/gh/mwouts/jupytext/pull/1177/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Marc+Wouts) | `75.02% <83.33%> (-0.13%)` | :arrow_down: | | [functional](https://app.codecov.io/gh/mwouts/jupytext/pull/1177/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Marc+Wouts) | `88.48% <66.66%> (-0.02%)` | :arrow_down: | | [integration](https://app.codecov.io/gh/mwouts/jupytext/pull/1177/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Marc+Wouts) | `77.28% <16.66%> (-0.06%)` | :arrow_down: | | [unit](https://app.codecov.io/gh/mwouts/jupytext/pull/1177/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Marc+Wouts) | `66.55% <66.66%> (+<0.01%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Marc+Wouts#carryforward-flags-in-the-pull-request-comment) to find out more.

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