Bump setuptools from 75.1.0 to 78.1.1 in /doc

Bumps [setuptools](https://github.com/pypa/setuptools) from 75.1.0 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@v75.1.0...v78.1.1)

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

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

Author: dependabot[bot]

doc/requirements.txt

@@ -31,4 +31,4 @@ sphinxcontrib-qthelp==1.0.3
 sphinxcontrib-serializinghtml==1.1.5
 urllib3>=2.2.2
 zipp==3.19.1
-setuptools==75.1.0
+setuptools==78.1.1