Update docutils requirement from <0.21,>=0.14 to >=0.21.2,<0.22

Updates the requirements on [docutils](https://docutils.sourceforge.io) to permit the latest version.

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

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

docs/requirements.txt

@@ -1,4 +1,4 @@
-docutils>=0.14,<0.21
+docutils>=0.21.2,<0.22
 ipykernel
 ipython
 jinja2>=3.0