Bump typing-extensions from 4.12.2 to 4.13.1 in /back-end

Bumps [typing-extensions](https://github.com/python/typing_extensions) from 4.12.2 to 4.13.1.
- [Release notes](https://github.com/python/typing_extensions/releases)
- [Changelog](https://github.com/python/typing_extensions/blob/main/CHANGELOG.md)
- [Commits](python/typing_extensions@4.12.2...4.13.1)

---
updated-dependencies:
- dependency-name: typing-extensions
  dependency-version: 4.13.1
  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==0.46.1
-typing_extensions==4.12.2
+typing_extensions==4.13.1
 uvicorn==0.34.0
 pytest==8.3.5
 pytest-cov==6.1.0