Bump starlette from 0.25.0 to 0.39.0

Bumps [starlette](https://github.com/encode/starlette) from 0.25.0 to 0.39.0.
- [Release notes](https://github.com/encode/starlette/releases)
- [Changelog](https://github.com/encode/starlette/blob/master/docs/release-notes.md)
- [Commits](encode/starlette@0.25.0...0.39.0)

---
updated-dependencies:
- dependency-name: starlette
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements.txt

@@ -37,7 +37,7 @@ requests==2.28.2
 rfc3986==1.5.0
 six==1.16.0
 sniffio==1.3.0
-starlette==0.25.0
+starlette==0.39.0
 tomli==2.0.1
 typing_extensions==4.5.0
 ujson==5.7.0