chore(deps): bump fastapi from 0.139.2 to 0.140.13

Bumps [fastapi](https://github.com/fastapi/fastapi) from 0.139.2 to 0.140.13.
- [Release notes](https://github.com/fastapi/fastapi/releases)
- [Commits](https://github.com/fastapi/fastapi/compare/0.139.2...0.140.13)

---
updated-dependencies:
- dependency-name: fastapi
  dependency-version: 0.140.13
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements.txt

@@ -1,4 +1,4 @@
-fastapi==0.139.2
+fastapi==0.140.13
 uvicorn[standard]==0.51.0
 httpx2==2.7.0
 python-dotenv==1.2.2