Bump uvicorn from 0.13.3 to 0.13.4

Bumps [uvicorn](https://github.com/encode/uvicorn) from 0.13.3 to 0.13.4.
- [Release notes](https://github.com/encode/uvicorn/releases)
- [Changelog](https://github.com/encode/uvicorn/blob/master/CHANGELOG.md)
- [Commits](encode/uvicorn@0.13.3...0.13.4)

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

test-requirements.txt

@@ -123,7 +123,7 @@ typing-extensions==3.7.4.3
     #   mypy
 urllib3==1.26.3
     # via requests
-uvicorn==0.13.3
+uvicorn==0.13.4
     # via -r test-requirements.in
 yarl==1.6.3
     # via aiohttp