Bump docutils from 0.16 to 0.20.1

Bumps [docutils](https://docutils.sourceforge.io/) from 0.16 to 0.20.1.

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

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

pyproject.toml

@@ -51,9 +51,9 @@ Documentation = "https://whey.readthedocs.io/en/latest"
 whey = "whey.__main__:main"
 
 [project.optional-dependencies]
-readme = [ "docutils==0.16", "pyproject-parser[readme]>=0.6.0",]
+readme = [ "docutils==0.20.1", "pyproject-parser[readme]>=0.6.0",]
 editable = [ "editables>=0.2",]
-all = [ "docutils==0.16", "editables>=0.2", "pyproject-parser[readme]>=0.6.0",]
+all = [ "docutils==0.20.1", "editables>=0.2", "pyproject-parser[readme]>=0.6.0",]
 
 [tool.mkrecipe]
 conda-channels = [ "conda-forge", "domdfcoding",]