Bump starlette from 0.38.5 to 0.40.0

Bumps [starlette](https://github.com/encode/starlette) from 0.38.5 to 0.40.0.
- [Release notes](https://github.com/encode/starlette/releases)
- [Changelog](https://github.com/encode/starlette/blob/master/docs/release-notes.md)
- [Commits](encode/starlette@0.38.5...0.40.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -1,5 +1,5 @@
 redis==5.0.8
-starlette==0.38.5
+starlette==0.40.0
 uvicorn==0.30.6
 python-dotenv==1.0.1
 sentry-sdk[starlette]