Bump requests in /doc in the pip group across 1 directory

Bumps the pip group with 1 update in the /doc directory: [requests](https://github.com/psf/requests).


Updates `requests` from 2.32.2 to 2.32.4
- [Release notes](https://github.com/psf/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/main/HISTORY.md)
- [Commits](psf/requests@v2.32.2...v2.32.4)

---
updated-dependencies:
- dependency-name: requests
  dependency-version: 2.32.4
  dependency-type: direct:production
  dependency-group: pip
...

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

Author: dependabot[bot]

doc/requirements.txt

@@ -20,7 +20,7 @@ packaging==23.2
 Pygments==2.17.2
 pyparsing==2.4.7
 pytz==2021.1
-requests==2.32.2
+requests==2.32.4
 snowballstemmer==2.1.0
 Sphinx==6.1.3
 sphinx-gallery==0.12.2