⬆️ Update docutils requirement from <0.21,>=0.16 to >=0.16,<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>

pyproject.toml

@@ -35,7 +35,7 @@ keywords = [
 ]
 requires-python = ">=3.8"
 dependencies = [
-    "docutils>=0.16,<0.21",
+    "docutils>=0.16,<0.22",
     "jinja2", # required for substitutions, but let sphinx choose version
     "markdown-it-py~=3.0",
     "mdit-py-plugins~=0.4",