build(deps): bump the production-dependencies group across 1 directory with 2 updates

Bumps the production-dependencies group with 2 updates in the /docs directory: [certifi](https://github.com/certifi/python-certifi) and [idna](https://github.com/kjd/idna).


Updates `certifi` from 2026.2.25 to 2026.4.22
- [Commits](certifi/python-certifi@2026.02.25...2026.04.22)

Updates `idna` from 3.12 to 3.13
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.rst)
- [Commits](kjd/idna@v3.12...v3.13)

---
updated-dependencies:
- dependency-name: certifi
  dependency-version: 2026.4.22
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: production-dependencies
- dependency-name: idna
  dependency-version: '3.13'
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: production-dependencies
...

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

Author: dependabot[bot]

docs/requirements.txt

@@ -3,11 +3,11 @@ Jinja2==3.1.6
 MarkupSafe==3.0.3
 Pygments==2.20.0
 Sphinx==8.2.3
-certifi==2026.2.25
+certifi==2026.4.22
 chardet==7.4.3
 commonmark==0.9.1
 docutils==0.20.1
-idna==3.12
+idna==3.13
 imagesize==2.0.0
 myst-parser==5.0.0 
 packaging==26.1