chore(deps): update starlette requirement from ~=0.19.1 to ~=0.20.4

Updates the requirements on [starlette](https://github.com/encode/starlette) to permit the latest version.
- [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...0.20.4)

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

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

Author: dependabot[bot]

requirements.txt

@@ -35,5 +35,5 @@ mkdocs-material~=8.3.9
 setuptools~=65.3.0
 fastapi~=0.81
 pyjwt~=2.4.0
-starlette~=0.19.1
+starlette~=0.20.4
 ujson~=5.4.0