Bump uvicorn from 0.34.1 to 0.34.2 in /back-end

Bumps [uvicorn](https://github.com/encode/uvicorn) from 0.34.1 to 0.34.2.
- [Release notes](https://github.com/encode/uvicorn/releases)
- [Changelog](https://github.com/encode/uvicorn/blob/master/docs/release-notes.md)
- [Commits](Kludex/uvicorn@0.34.1...0.34.2)

---
updated-dependencies:
- dependency-name: uvicorn
  dependency-version: 0.34.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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==0.46.2
 typing_extensions==4.13.2
-uvicorn==0.34.1
+uvicorn==0.34.2
 pytest==8.3.5
 pytest-cov==6.1.1
 mysql-connector==2.2.9