chore(deps): bump fastapi from 0.136.0 to 0.137.1 in /reference

Bumps [fastapi](https://github.com/fastapi/fastapi) from 0.136.0 to 0.137.1.
- [Release notes](https://github.com/fastapi/fastapi/releases)
- [Commits](fastapi/fastapi@0.136.0...0.137.1)

---
updated-dependencies:
- dependency-name: fastapi
  dependency-version: 0.137.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

reference/requirements.lock.txt

@@ -1,5 +1,5 @@
 # Locked direct dependencies for the reference gateway.
 # Refresh by resolving in a Python 3.11+ virtual environment.
-fastapi==0.136.0
+fastapi==0.137.1
 jsonschema==4.26.0
 uvicorn==0.44.0

reference/requirements.txt

@@ -1,3 +1,3 @@
-fastapi>=0.115
+fastapi>=0.137.1
 uvicorn>=0.34
 jsonschema>=4.23