build(deps): bump fastapi from 0.110.2 to 0.111.0 in /backend

Bumps [fastapi](https://github.com/tiangolo/fastapi) from 0.110.2 to 0.111.0.
- [Release notes](https://github.com/tiangolo/fastapi/releases)
- [Commits](fastapi/fastapi@0.110.2...0.111.0)

---
updated-dependencies:
- dependency-name: fastapi
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>