Bump soupsieve from 2.8.3 to 2.8.4

Bumps [soupsieve](https://github.com/facelessuser/soupsieve) from 2.8.3 to 2.8.4.
- [Release notes](https://github.com/facelessuser/soupsieve/releases)
- [Commits](facelessuser/soupsieve@2.8.3...2.8.4)

---
updated-dependencies:
- dependency-name: soupsieve
  dependency-version: 2.8.4
  dependency-type: direct:production
...

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

Author: dependabot[bot]

docs/requirements.txt

@@ -18,7 +18,7 @@ roman-numerals==4.1.0
 roman-numerals-py==3.1.0
 setuptools==80.10.1
 snowballstemmer==3.0.1
-soupsieve==2.8.3
+soupsieve==2.8.4
 Sphinx==9.1.0
 sphinx-basic-ng==1.0.0b2
 sphinx-copybutton==0.5.2