Deps: Bump the python-packages group across 1 directory with 3 updates

Bumps the python-packages group with 3 updates in the / directory: [certifi](https://github.com/certifi/python-certifi), [idna](https://github.com/kjd/idna) and [lxml](https://github.com/lxml/lxml).


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

Updates `idna` from 3.14 to 3.16
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.md)
- [Commits](kjd/idna@v3.14...v3.16)

Updates `lxml` from 6.1.0 to 6.1.1
- [Release notes](https://github.com/lxml/lxml/releases)
- [Changelog](https://github.com/lxml/lxml/blob/master/CHANGES.txt)
- [Commits](lxml/lxml@lxml-6.1.0...lxml-6.1.1)

---
updated-dependencies:
- dependency-name: certifi
  dependency-version: 2026.5.20
  dependency-type: indirect
  update-type: version-update:semver-minor
  dependency-group: python-packages
- dependency-name: idna
  dependency-version: '3.16'
  dependency-type: indirect
  update-type: version-update:semver-minor
  dependency-group: python-packages
- dependency-name: lxml
  dependency-version: 6.1.1
  dependency-type: indirect
  update-type: version-update:semver-patch
  dependency-group: python-packages
...

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

Author: dependabot[bot]