Bump uvicorn from 0.46.0 to 0.47.0 in /back-end

Bumps [uvicorn](https://github.com/Kludex/uvicorn) from 0.46.0 to 0.47.0.
- [Release notes](https://github.com/Kludex/uvicorn/releases)
- [Changelog](https://github.com/Kludex/uvicorn/blob/main/docs/release-notes.md)
- [Commits](Kludex/uvicorn@0.46.0...0.47.0)

---
updated-dependencies:
- dependency-name: uvicorn
  dependency-version: 0.47.0
  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

@@ -14,7 +14,7 @@ six==1.17.0
 sniffio==1.3.1
 starlette==0.48.0
 typing_extensions==4.15.0
-uvicorn==0.46.0
+uvicorn==0.47.0
 pytest==9.0.3
 pytest-cov==7.1.0
 mysql-connector==2.2.9