Bump starlette from 0.13.6 to 0.14.1

Bumps [starlette](https://github.com/encode/starlette) from 0.13.6 to 0.14.1.
- [Release notes](https://github.com/encode/starlette/releases)
- [Changelog](https://github.com/encode/starlette/blob/master/docs/release-notes.md)
- [Commits](encode/starlette@0.13.6...0.14.1)

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

requirements.txt

@@ -20,7 +20,7 @@ pyparsing==2.4.7
 pytest==6.2.1
 regex==2020.11.13
 requests==2.25.1
-starlette==0.13.6
+starlette==0.14.1
 toml==0.10.2
 typed-ast==1.4.1
 typing-extensions==3.7.4.3