build(deps): update docutils requirement from <0.21,>=0.16 to >=0.16,<0.22 in /requirements (#20792)

build(deps): update docutils requirement in /requirements

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

---
updated-dependencies:
- dependency-name: docutils
  dependency-version: 0.21.2
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements/docs.txt

@@ -3,7 +3,7 @@ myst-parser >=0.18.1, <3.0.0
 nbsphinx >=0.8.5, <=0.9.2
 nbconvert <7.14  # temporary fix for https://github.com/jupyter/nbconvert/issues/2092
 pandoc >=1.0, <=2.3
-docutils >=0.16, <0.21
+docutils >=0.16, <0.22
 sphinxcontrib-fulltoc >=1.0, <=1.2.0
 sphinxcontrib-mockautodoc
 sphinx-autobuild