Bump soupsieve from 2.8 to 2.8.4 in /notebook_python

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]

notebook_python/requirements_notebook.txt

@@ -77,7 +77,7 @@ Send2Trash==1.8.3
 setuptools==80.9.0
 six==1.17.0
 sniffio==1.3.1
-soupsieve==2.8
+soupsieve==2.8.4
 stack-data==0.6.3
 terminado==0.18.1
 tinycss2==1.4.0