Bump uvicorn from 0.31.0 to 0.31.1 in /backend (#75)

Bumps [uvicorn](https://github.com/encode/uvicorn) from 0.31.0 to 0.31.1.
- [Release notes](https://github.com/encode/uvicorn/releases)
- [Changelog](https://github.com/encode/uvicorn/blob/master/CHANGELOG.md)
- [Commits](encode/uvicorn@0.31.0...0.31.1)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

backend/poetry.lock

@@ -9,7 +9,7 @@ packages = [{include = "quotes"}]
 [tool.poetry.dependencies]
 python = "^3.11"
 fastapi = "^0.115.0"
-uvicorn = "^0.31.0"
+uvicorn = "^0.31.1"
 pydantic = "^2.9.2"
 pydantic-settings = "^2.5.2"
 fiaas-logging = "^0.1.1"