Bump async-timeout from 3.0.1 to 4.0.3

Summary:
Bumps [async-timeout](https://github.com/aio-libs/async-timeout) from 3.0.1 to 4.0.3.

Release notes https://github.com/aio-libs/async-timeout/releases

This matches more closely to what version we use internally 4.0.2

Reviewed By: cxxxs

Differential Revision: D51760088

fbshipit-source-id: 5bae35196ef43bbde487659d0e53d60c33cc06d5

pyproject.toml

@@ -31,7 +31,7 @@ dependencies = [
 
 [project.optional-dependencies]
 dev = [
-    "async-timeout==3.0.1",
+    "async-timeout==4.0.3",
     "coverage==4.5.4",
 ]