Update fastapi requirement from ~=0.88.0 to ~=0.89.0 (#64)

Updates the requirements on [fastapi](https://github.com/tiangolo/fastapi) to permit the latest version.
- [Release notes](https://github.com/tiangolo/fastapi/releases)
- [Commits](tiangolo/fastapi@0.88.0...0.89.0)

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

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requirements.txt

@@ -1,4 +1,4 @@
-fastapi~=0.88.0
+fastapi~=0.89.0
 httpx~=0.23.3
 hypercorn~=0.14.3
 pydantic~=1.10.4