Bump uvicorn from 0.11.5 to 0.11.7 in /backend Bumps [uvicorn](https://github.com/encode/uvicorn) from 0.11.5 to 0.11.7. - [Release notes](https://github.com/encode/uvicorn/releases) - [Changelog](https://github.com/encode/uvicorn/blob/master/CHANGELOG.md) - [Commits](https://github.com/encode/uvicorn/compare/0.11.5...0.11.7) Signed-off-by: dependabot[bot]