Jupytext

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**Changed**
- We have updated the GitHub workflows - thanks to Matthew Feickert and to Cristian Le for their help on this subject ([1037](https://github.com/mwouts/jupytext/issues/1037))
- We have removed the upper bound on `markdown-it-py<3`. Now we test Jupytext with `markdown-it-py` in versions `2.x` and `3.x` on the CI ([1075](https://github.com/mwouts/jupytext/issues/1075))

**Fixed**
- Notebooks with an empty YAML header work ([1070](https://github.com/mwouts/jupytext/issues/1070))
- Double quote strings in R Markdown options can contain single quotes ([1079](https://github.com/mwouts/jupytext/issues/1079))
- The necessary directories are created when paired notebooks are moved to a sub-folder ([1059](https://github.com/mwouts/jupytext/issues/1059))
- Commented quotes are recognized as such ([1060](https://github.com/mwouts/jupytext/issues/1060))
- Jupytext can use either `pkg_resources` or `packaging` to parse version numbers ([1085](https://github.com/mwouts/jupytext/issues/1085))

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**Changed**
- This version comes with a build requirement `jupyterlab>=3,<4`, as the Jupyterlab
extension for Jupytext is not compatible with JupyterLab 4 yet ([1054](https://github.com/mwouts/jupytext/issues/1054))
- The JupyterLab extension was released to `npm` in version 1.3.9.

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**Added**
- Added Stata as a supported language ([1027](https://github.com/mwouts/jupytext/pull/1027)) - thanks to [Raffaele Mancuso](https://github.com/raffaem) for this contribution
- Added SAS as a supported language ([1047](https://github.com/mwouts/jupytext/pull/1047)) - thanks to [lawrencet149](https://github.com/lawrencet149) for this contribution
- We have added a series of test to make sure that the main formats support cell tags ([1024](https://github.com/mwouts/jupytext/issues/1024))

**Fixed**
- When a metadata key is not a valid identifier, a warning is emitted and the metadata is not saved to the text representation ([1042](https://github.com/mwouts/jupytext/issues/1042))
- The CI was fixed by [Matthew Feickert](https://github.com/matthewfeickert) ([#1035](https://github.com/mwouts/jupytext/pull/1035))
- We now use `concurrency` to cancel previous runs on the same branch/PR ([1037](https://github.com/mwouts/jupytext/issues/1037))
- We use both `codecov.notify.after_n_builds` and `comment.after_n_builds` to get only the final codecov comment

**Changed**
- Empty tags are not exported to the text notebook anymore ([960](https://github.com/mwouts/jupytext/issues/960))
- We updated the `yarn.lock` file for the jupyter lab extension to address security vulnerabilities ([1030](https://github.com/mwouts/jupytext/issues/1030), [#1036](https://github.com/mwouts/jupytext/issues/1036))
- In the pre-commit tests we now use `main` for the main branch

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**Added**
- Added Wolfram Language as a supported language ([1014](https://github.com/mwouts/jupytext/issues/1014)) - thanks to [Etienne Dechamps](https://github.com/dechamps) for this contribution

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**Fixed**
- When the default contents manager is _async_ (i.e. `jupyter_server>=2.0.0`), the Jupyter server extension for Jupytext derives a contents manager from `LargeFileManager` instead, as async contents managers are not supported by Jupytext at the moment ([1020](https://github.com/mwouts/jupytext/issues/1020))
- We have made adjustments on the CI as flake8 was moved to GitHub, and Python 3.6 is not available anymore on `ubuntu-latest`

-------------------

**Fixed**
- The sample notebooks have been normalized with `nbformat.validator.normalize` ([1002](https://github.com/mwouts/jupytext/issues/1002)).
- The warnings in the test suite that we cannot fix are filtered using a new `pytest.ini` file
- We updated the `yarn.lock` file for the jupyter lab extension to address security vulnerabilities ([984](https://github.com/mwouts/jupytext/issues/984), [#1005](https://github.com/mwouts/jupytext/issues/1005), [#1011](https://github.com/mwouts/jupytext/issues/1011))

**Changed**
- The CI uses Python 3.9 rather than 3.7 when testing conda environments

**Added**
- Gnuplot is now supported ([998](https://github.com/mwouts/jupytext/issues/998)) - thanks to [razimantv](https://github.com/razimantv) for this contribution
- We now test Jupytext against Python 3.6 to 3.11 on the CI
- We have added a test to document how to use the folder and prefix matching when pairing notebooks ([974](https://github.com/mwouts/jupytext/issues/974))