build(deps): bump soupsieve from 2.8 to 2.8.4

Bumps [soupsieve](https://github.com/facelessuser/soupsieve) from 2.8 to 2.8.4.
- [Release notes](https://github.com/facelessuser/soupsieve/releases)
- [Commits](facelessuser/soupsieve@2.8...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]

requirements.txt

@@ -72,7 +72,7 @@ setuptools-scm==9.2.2
     # via libsemigroups_pybind11 (pyproject.toml::build-system.requires)
 snowballstemmer==3.0.1
     # via sphinx
-soupsieve==2.8
+soupsieve==2.8.4
     # via beautifulsoup4
 sphinx==8.2.3 ; python_version > "3.10"
     # via