Bump async-timeout from 3.0.1 to 4.0.3

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)
- [Changelog](https://github.com/aio-libs/async-timeout/blob/master/CHANGES.rst)
- [Commits](aio-libs/async-timeout@v3.0.1...v4.0.3)

---
updated-dependencies:
- dependency-name: async-timeout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

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",
 ]