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] <[email protected]>

Author: dependabot[bot]

requirements.txt

@@ -10,7 +10,7 @@ myst-parser==0.17.2
 ablog==0.10.6  # pyup: ignore
 
 # Sphinx (checked with 4.3) requires docutils=<0.18
-docutils==0.17.1   # pyup: <0.18
+docutils==0.20.1   # pyup: <0.18
 PyYAML>=4.2b1
 
 # Additional libraries