Bump attrs from 22.2.0 to 23.2.0 in /docs

Bumps [attrs](https://github.com/sponsors/hynek) from 22.2.0 to 23.2.0.
- [Commits](https://github.com/sponsors/hynek/commits)

---
updated-dependencies:
- dependency-name: attrs
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

docs/requirements.txt

@@ -8,5 +8,5 @@ rstcheck==6.1.1
 myst-parser==1.0.0 
 linkify-it-py==2.0.0
 esbonio==0.16.4
-attrs==22.2.0
+attrs==23.2.0