Update jupytext requirement from 1.13.3 to 1.13.7 (#141)

Updates the requirements on [jupytext](https://github.com/mwouts/jupytext) to permit the latest version.
- [Release notes](https://github.com/mwouts/jupytext/releases)
- [Changelog](https://github.com/mwouts/jupytext/blob/main/docs/CHANGELOG.md)
- [Commits](mwouts/jupytext@v1.13.3...v1.13.7)

---
updated-dependencies:
- dependency-name: jupytext
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

pyproject.toml

@@ -63,7 +63,7 @@ sphinx-notfound-page = { version = "0.8", optional = true }
 sphinx-copybutton = { version = "0.5.0", optional = true }
 enum_tools = { version = "0.9.0", optional = true }
 sphinx-toolbox = { version = "2.17.0", optional = true }
-jupytext = { version = "1.13.3", optional = true }
+jupytext = { version = "1.13.7", optional = true }
 nbsphinx = { version = "0.8.7", optional = true }
 
 [tool.poetry.extras]