Bump fastapi from 0.140.0 to 0.141.1 in /backend (#227)

Bumps [fastapi](https://github.com/fastapi/fastapi) from 0.140.0 to 0.141.1.
- [Release notes](https://github.com/fastapi/fastapi/releases)
- [Commits](fastapi/fastapi@0.140.0...0.141.1)

---
updated-dependencies:
- dependency-name: fastapi
  dependency-version: 0.141.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

backend/requirements-docker.txt

@@ -1,6 +1,6 @@
 ariadne==1.1.0
 asyncpg==0.31.0
-fastapi==0.140.0
+fastapi==0.141.1
 httpx==0.28.1
 pydantic==2.13.4
 python-multipart==0.0.32

backend/src/requirements_docker.txt

@@ -1,7 +1,7 @@
 ariadne==1.1.0
 asyncpg==0.31.0
 black==26.5.1
-fastapi==0.140.0
+fastapi==0.141.1
 flake8==7.3.0
 httpx==0.28.1
 isort==8.0.1