Bump starlette from 0.19.1 to 0.40.0

Bumps [starlette](https://github.com/encode/starlette) from 0.19.1 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@0.19.1...0.40.0)

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

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

requirements.txt

@@ -28,7 +28,7 @@ pyyaml==6.0
 six==1.16.0
 sniffio==1.3.0
 sqlalchemy==1.4.41
-starlette==0.19.1
+starlette==0.40.0
 typing-extensions==4.4.0
 uvicorn[standard]==0.18.3
 uvloop==0.17.0