Bump myst-nb from 1.1.1 to 1.1.2 (#970)

Bumps [myst-nb](https://github.com/executablebooks/myst-nb) from 1.1.1 to 1.1.2.
- [Release notes](https://github.com/executablebooks/myst-nb/releases)
- [Changelog](https://github.com/executablebooks/MyST-NB/blob/master/CHANGELOG.md)
- [Commits](executablebooks/MyST-NB@v1.1.1...v1.1.2)

---
updated-dependencies:
- dependency-name: myst-nb
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

requirements_doc.txt

@@ -12,6 +12,6 @@ sphinx-toggleprompt==0.5.2
 sphinx-copybutton==0.5.2  # does not work well with toggleprompt
 
 breathe==4.35.0
-myst-nb==1.1.1
+myst-nb==1.1.2
 nbclient==0.10.0
 docutils==0.21.2