chore(deps): bump idna in /examples/fastapi-background-tasks/app

Bumps [idna](https://github.com/kjd/idna) from 3.10 to 3.15.
- [Release notes](https://github.com/kjd/idna/releases)
- [Changelog](https://github.com/kjd/idna/blob/master/HISTORY.md)
- [Commits](kjd/idna@v3.10...v3.15)

---
updated-dependencies:
- dependency-name: idna
  dependency-version: '3.15'
  dependency-type: direct:production
...

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

Author: dependabot[bot]

examples/fastapi-background-tasks/app/requirements.txt

@@ -3,7 +3,7 @@ anyio==4.6.2.post1
 certifi==2024.8.30
 charset-normalizer==3.4.0
 fastapi==0.115.5
-idna==3.10
+idna==3.15
 pydantic==2.9.2
 pydantic-core==2.23.4
 requests==2.32.3