build(deps): bump astroid from 2.9.2 to 2.9.3

Bumps [astroid](https://github.com/PyCQA/astroid) from 2.9.2 to 2.9.3.
- [Release notes](https://github.com/PyCQA/astroid/releases)
- [Changelog](https://github.com/PyCQA/astroid/blob/main/ChangeLog)
- [Commits](pylint-dev/astroid@v2.9.2...v2.9.3)

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

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -1,5 +1,5 @@
 appdirs==1.4.4
-astroid==2.9.2
+astroid==2.9.3
 atomicwrites==1.4.0
 attrs==21.4.0
 black==21.4b2