chore(deps): bump idna from 3.15 to 3.16

Bumps [idna](https://github.com/kjd/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)

---
updated-dependencies:
- dependency-name: idna
  dependency-version: '3.16'
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements.txt

@@ -3,7 +3,7 @@ Babel==2.18.0
 certifi==2026.4.22
 charset-normalizer==3.4.7
 docutils==0.21.2
-idna==3.15
+idna==3.16
 imagesize==2.0.0
 importlib-metadata==9.0.0
 Jinja2==3.1.6