Update fastapi requirement from ~=0.106.0 to ~=0.108.0

Updates the requirements on [fastapi](https://github.com/tiangolo/fastapi) to permit the latest version.
- [Release notes](https://github.com/tiangolo/fastapi/releases)
- [Commits](fastapi/fastapi@0.106.0...0.108.0)

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

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

requirements.txt

@@ -1,4 +1,4 @@
-fastapi~=0.106.0
+fastapi~=0.108.0
 uvicorn~=0.25.0
 fastapi-chameleon
 starlette<0.35.0