deps: update fastapi requirement from >=0.138.0 to >=0.139.0 (#24)

Updates the requirements on [fastapi](https://github.com/fastapi/fastapi) to permit the latest version.
- [Release notes](https://github.com/fastapi/fastapi/releases)
- [Commits](fastapi/fastapi@0.138.0...0.139.0)

---
updated-dependencies:
- dependency-name: fastapi
  dependency-version: 0.139.0
  dependency-type: direct:production
...

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Author: dependabot[bot]

service/requirements.txt

@@ -1,3 +1,3 @@
-fastapi>=0.138.0
+fastapi>=0.139.0
 uvicorn[standard]>=0.49.0
 pydantic>=2.13.4