Bump async-timeout from 4.0.2 to 4.0.3 (#48)

Bumps [async-timeout](https://github.com/aio-libs/async-timeout) from 4.0.2 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@v4.0.2...v4.0.3)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -6,7 +6,7 @@
 #
 
 -i https://pypi.org/simple/
-async-timeout==4.0.2; python_version >= '3.6'
+async-timeout==4.0.3; python_version >= '3.6'
 bottle==0.12.24
 certifi==2023.7.22; python_version >= '3.6'
 charset-normalizer==3.1.0; python_version >= '3.7'