Bump starlette from 0.49.3 to 0.50.0

Bumps [starlette](https://github.com/Kludex/starlette) from 0.49.3 to 0.50.0.
- [Release notes](https://github.com/Kludex/starlette/releases)
- [Changelog](https://github.com/Kludex/starlette/blob/main/docs/release-notes.md)
- [Commits](Kludex/starlette@0.49.3...0.50.0)

---
updated-dependencies:
- dependency-name: starlette
  dependency-version: 0.50.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

poetry.lock

@@ -100,7 +100,7 @@ pytest-flake8 = "*"
 pytest-cov = "*"
 python-multipart = "*"
 responses = "*"
-starlette = ">=0.26.1,<0.50.0"
+starlette = ">=0.26.1,<0.51.0"
 strict-rfc3339 = "^0.7"
 webob = "*"
 mypy = "^1.2"