Bump starlette from 0.38.4 to 0.40.0

Bumps [starlette](https://github.com/encode/starlette) from 0.38.4 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@0.38.4...0.40.0)

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

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

requirements.txt

@@ -26,7 +26,7 @@ pydantic_core==2.20.1
 python-dotenv==0.21.1
 requests==2.32.3
 sniffio==1.3.0
-starlette==0.38.4
+starlette==0.40.0
 typing_extensions==4.9.0
 urllib3==2.2.2
 uvicorn==0.30.6