Bump docutils from 0.16 to 0.20

Bumps [docutils](https://docutils.sourceforge.io/) from 0.16 to 0.20.

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

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

docs/requirements.txt

@@ -1,7 +1,7 @@
 black
 codecov
 coverage
-docutils==0.16
+docutils==0.20
 pre-commit
 pytest
 Sphinx