Bump soupsieve from 2.4.1 to 2.6

Bumps [soupsieve](https://github.com/facelessuser/soupsieve) from 2.4.1 to 2.6.
- [Release notes](https://github.com/facelessuser/soupsieve/releases)
- [Commits](facelessuser/soupsieve@2.4.1...2.6)

---
updated-dependencies:
- dependency-name: soupsieve
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

sphinx/requirements.txt

@@ -18,7 +18,7 @@ Pygments==2.18.0
 pytz==2024.1
 requests==2.32.3
 snowballstemmer==2.2.0
-soupsieve==2.4.1
+soupsieve==2.6
 Sphinx==5.3.0
 sphinxcontrib-applehelp==1.0.2
 sphinxcontrib-devhelp==1.0.2