Bump docutils from 0.17.1 to 0.20.1

Bumps [docutils](https://docutils.sourceforge.io/) from 0.17.1 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

@@ -28,7 +28,7 @@ requires-python = ">=3.7"
 dependencies = ["requests>=2.28.1", "pandas>=2", "pycountry>=22.3.5"]
 [project.optional-dependencies]
 docs = [
-	"docutils==0.17.1",    # https://jupyterbook.org/en/stable/content/citations.html?highlight=docutils#citations-and-bibliographies
+	"docutils==0.20.1",    # https://jupyterbook.org/en/stable/content/citations.html?highlight=docutils#citations-and-bibliographies
 	"jupyter-book >=1,<2",
 ]