chore(deps): update fastapi requirement from >=0.115.0 to >=0.136.3 (#11)

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@0.115.0...0.136.3)

---
updated-dependencies:
- dependency-name: fastapi
  dependency-version: 0.136.1
  dependency-type: direct:production
...

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Author: dependabot[bot]

requirements.txt

@@ -1,5 +1,5 @@
 ortools>=9.15.6755
-fastapi>=0.115.0
+fastapi>=0.136.3
 uvicorn[standard]>=0.30.0
 pydantic>=2.13.4
 fastapi-mcp>=0.4.0