Bump typing-extensions from 4.13.2 to 4.14.0 in /back-end

Bumps [typing-extensions](https://github.com/python/typing_extensions) from 4.13.2 to 4.14.0.
- [Release notes](https://github.com/python/typing_extensions/releases)
- [Changelog](https://github.com/python/typing_extensions/blob/main/CHANGELOG.md)
- [Commits](python/typing_extensions@4.13.2...4.14.0)

---
updated-dependencies:
- dependency-name: typing-extensions
  dependency-version: 4.14.0
  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

@@ -13,7 +13,7 @@ python-multipart==0.0.20
 six==1.17.0
 sniffio==1.3.1
 starlette==0.46.2
-typing_extensions==4.13.2
+typing_extensions==4.14.0
 uvicorn==0.34.3
 pytest==8.4.0
 pytest-cov==6.1.1