chore(deps): bump soupsieve from 2.8.4 to 2.9 in /docs (#621)

Bumps [soupsieve](https://github.com/facelessuser/soupsieve) from 2.8.4 to 2.9.
- [Release notes](https://github.com/facelessuser/soupsieve/releases)
- [Commits](facelessuser/soupsieve@2.8.4...2.9)

---
updated-dependencies:
- dependency-name: soupsieve
  dependency-version: '2.9'
  dependency-type: indirect
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

docs/requirements.txt

@@ -32,7 +32,7 @@ requests==2.33.0
     # via sphinx
 snowballstemmer==2.2.0
     # via sphinx
-soupsieve==2.8.4
+soupsieve==2.9
     # via beautifulsoup4
 sphinx==7.4.7
     # via