pip: bump docutils from 0.17.1 to 0.18.1

Bumps [docutils](https://docutils.sourceforge.io/) from 0.17.1 to 0.18.1.

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

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

requirements.txt

@@ -3,7 +3,7 @@ Babel==2.12.1
 certifi==2023.5.7
 charset-normalizer==3.2.0
 click==8.1.5
-docutils==0.17.1
+docutils==0.18.1
 idna==3.4
 imagesize==1.4.1
 Jinja2==3.1.2