Bump requests from 2.26.0 to 2.31.0 in /docs (#2545)

Bumps [requests](https://github.com/psf/requests) from 2.26.0 to 2.31.0.
- [Release notes](https://github.com/psf/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/main/HISTORY.md)
- [Commits](psf/requests@v2.26.0...v2.31.0)

---
updated-dependencies:
- dependency-name: requests
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

docs/requirements.txt

@@ -5,6 +5,6 @@ ipython==7.31.1
 ipykernel==6.4.2
 breathe==4.31.0
 sphinxcontrib-svg2pdfconverter==1.1.1
-requests==2.26.0
+requests==2.31.0
 gmlc-tdc-sphinxcontrib-redoc==1.6.1a1
 sphinxcontrib-mermaid==0.8.1