Bump setuptools in /docs in the pip group across 1 directory

Bumps the pip group with 1 update in the /docs directory: [setuptools](https://github.com/pypa/setuptools).


Updates `setuptools` from 75.8.2 to 78.1.1
- [Release notes](https://github.com/pypa/setuptools/releases)
- [Changelog](https://github.com/pypa/setuptools/blob/main/NEWS.rst)
- [Commits](pypa/setuptools@v75.8.2...v78.1.1)

---
updated-dependencies:
- dependency-name: setuptools
  dependency-version: 78.1.1
  dependency-type: direct:production
  dependency-group: pip
...

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

Author: dependabot[bot]

docs/requirements.txt

@@ -2,7 +2,7 @@ doc8==0.10.1
 docutils==0.20.1
 furo==2024.8.6
 GitPython==3.1.44
-setuptools==75.8.2
+setuptools==78.1.1
 sphinx_rtd_theme==3.0.2
 sphinx-sitemap==2.6.0
 sphinx==8.2.3