Bump starlette from 0.38.6 to 0.40.0

Bumps [starlette](https://github.com/encode/starlette) from 0.38.6 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@0.38.6...0.40.0)

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

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

requirements.txt

@@ -128,7 +128,7 @@ sniffio==1.3.1
 social-auth-app-django==5.4.2
 social-auth-core==4.5.4
 sqlparse==0.5.1
-starlette==0.38.6
+starlette==0.40.0
 strawberry-graphql==0.243.1
 strawberry-graphql-django==0.48.0
 svgwrite==1.4.3