Bump markdown-it-py from 1.1.0 to 2.2.0 in /doc/sphinx (#62)

Bumps [markdown-it-py](https://github.com/executablebooks/markdown-it-py) from 1.1.0 to 2.2.0.
- [Release notes](https://github.com/executablebooks/markdown-it-py/releases)
- [Changelog](https://github.com/executablebooks/markdown-it-py/blob/master/CHANGELOG.md)
- [Commits](executablebooks/markdown-it-py@v1.1.0...v2.2.0)

---
updated-dependencies:
- dependency-name: markdown-it-py
  dependency-type: direct:production
...

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

doc/sphinx/requirements.txt

@@ -16,7 +16,7 @@ docutils==0.16
 idna==2.10
 imagesize==1.2.0
 Jinja2==3.0.0
-markdown-it-py==1.1.0
+markdown-it-py==2.2.0
 MarkupSafe==2.0.0
 mdit-py-plugins==0.2.8
 myst-parser==0.14.0