Bump starlette from 0.37.2 to 0.38.2

Bumps [starlette](https://github.com/encode/starlette) from 0.37.2 to 0.38.2.
- [Release notes](https://github.com/encode/starlette/releases)
- [Changelog](https://github.com/encode/starlette/blob/master/docs/release-notes.md)
- [Commits](encode/starlette@0.37.2...0.38.2)

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

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

requirements.txt

@@ -16,7 +16,7 @@ pytest-xdist==3.6.1
 pytest==7.4.4
 quart==0.19.6
 reactivex==4.0.4
-starlette==0.37.2
+starlette==0.38.2
 cbitstruct==1.1.0
 cloudevents==1.10.1
 pydantic==1.10.14