Bump docutils from 0.19 to 0.21.2

Bumps [docutils](https://docutils.sourceforge.io) from 0.19 to 0.21.2.

---
updated-dependencies:
- dependency-name: docutils
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

dev-requirements.txt

@@ -5,7 +5,7 @@ nbsphinx
 Sphinx==7.0.1
 sphinx_rtd_theme
 numpydoc
-docutils==0.19
+docutils==0.21.2
 sphinx-copybutton
 IPython
 nbsphinx-link