chore(deps): bump fastapi from 0.121.1 to 0.121.3

Bumps [fastapi](https://github.com/fastapi/fastapi) from 0.121.1 to 0.121.3.
- [Release notes](https://github.com/fastapi/fastapi/releases)
- [Commits](fastapi/fastapi@0.121.1...0.121.3)

---
updated-dependencies:
- dependency-name: fastapi
  dependency-version: 0.121.3
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

requirements.txt

@@ -37,7 +37,7 @@ orjson==3.11.4
 sdnotify==0.3.2
 
 # API Server
-fastapi==0.121.1
+fastapi==0.121.3
 pydantic==2.12.4
 uvicorn==0.38.0
 pyjwt==2.10.1