build(deps): bump the production-dependencies group across 1 directory with 3 updates

Bumps the production-dependencies group with 3 updates in the /docs directory: [certifi](https://github.com/certifi/python-certifi), [idna](https://github.com/kjd/idna) and [requests](https://github.com/psf/requests).


Updates `certifi` from 2026.4.22 to 2026.5.20
- [Commits](certifi/python-certifi@2026.04.22...2026.05.20)

Updates `idna` from 3.15 to 3.16
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.md)
- [Commits](kjd/idna@v3.15...v3.16)

Updates `requests` from 2.34.0 to 2.34.2
- [Release notes](https://github.com/psf/requests/releases)
- [Changelog](https://github.com/psf/requests/blob/main/HISTORY.md)
- [Commits](psf/requests@v2.34.0...v2.34.2)

---
updated-dependencies:
- dependency-name: certifi
  dependency-version: 2026.5.20
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: production-dependencies
- dependency-name: idna
  dependency-version: '3.16'
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: production-dependencies
- dependency-name: requests
  dependency-version: 2.34.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: production-dependencies
...

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

Author: dependabot[bot]

docs/requirements.txt

@@ -3,17 +3,17 @@ Jinja2==3.1.6
 MarkupSafe==3.0.3
 Pygments==2.20.0
 Sphinx==8.2.3
-certifi==2026.4.22
+certifi==2026.5.20
 chardet==7.4.3
 commonmark==0.9.1
 docutils==0.20.1
-idna==3.15
+idna==3.16
 imagesize==2.0.0
 myst-parser==5.1.0 
 packaging==26.2
 pyparsing==3.3.2
 pytz==2026.2
-requests==2.34.0
+requests==2.34.2
 snowballstemmer==3.0.1
 sphinx-favicon==1.1.0
 sphinx-rtd-theme==3.1.0