chore(deps): bump uvicorn[standard] from 0.30.6 to 0.34.0 in /backend

Bumps [uvicorn[standard]](https://github.com/encode/uvicorn) from 0.30.6 to 0.34.0.
- [Release notes](https://github.com/encode/uvicorn/releases)
- [Changelog](https://github.com/encode/uvicorn/blob/master/docs/release-notes.md)
- [Commits](https://github.com/encode/uvicorn/compare/0.30.6...0.34.0)

---
updated-dependencies:
- dependency-name: uvicorn[standard]
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

backend/requirements.txt

@@ -1,5 +1,5 @@
 fastapi==0.115.7
-uvicorn[standard]==0.30.6
+uvicorn[standard]==0.34.0
 pydantic==2.10.6
 python-multipart==0.0.18