build(deps): bump the production-dependencies group across 1 directory with 3 updates (#4415)

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 [packaging](https://github.com/pypa/packaging).


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)

Updates `packaging` from 26.1 to 26.2
- [Release notes](https://github.com/pypa/packaging/releases)
- [Changelog](https://github.com/pypa/packaging/blob/main/CHANGELOG.rst)
- [Commits](pypa/packaging@26.1...26.2)

---
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
- dependency-name: packaging
  dependency-version: '26.2'
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: production-dependencies
...

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

Author: dependabot[bot]

docs/requirements.txt

@@ -3,14 +3,14 @@ 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
+packaging==26.2
 pyparsing==3.3.2
 pytz==2026.1.post1
 requests==2.33.1