Bump docutils from 0.19 to 0.21.1 (#52)

* Bump docutils from 0.19 to 0.21.1

Bumps [docutils](https://docutils.sourceforge.io) from 0.19 to 0.21.1.

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

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

* keep old docutils on 3.8

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Amethyst Reese <amethyst@n7.gg>

pyproject.toml

@@ -32,7 +32,8 @@ dependencies = [
 
 [project.optional-dependencies]
 dev = [
-    "docutils==0.19",
+    "docutils==0.20.1; python_version < '3.9'",
+    "docutils==0.21.1; python_version >= '3.9'",
     "mistune==2.0.4",
 
     "attribution==1.6.2",