Bump idna from 3.10 to 3.11 in /back-end

Bumps [idna](https://github.com/kjd/idna) from 3.10 to 3.11.
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.rst)
- [Commits](kjd/idna@v3.10...v3.11)

---
updated-dependencies:
- dependency-name: idna
  dependency-version: '3.11'
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

back-end/requirements.txt

@@ -5,7 +5,7 @@ contextlib2==21.6.0
 contextvars==2.4
 fastapi==0.118.0
 h11==0.16.0
-idna==3.10
+idna==3.11
 immutables==0.21
 importlib-metadata==8.7.0
 pydantic==2.12.0