Bump pylint from 2.8.1 to 2.9.3 (#183)

Bumps [pylint](https://github.com/PyCQA/pylint) from 2.8.1 to 2.9.3.
- [Release notes](https://github.com/PyCQA/pylint/releases)
- [Changelog](https://github.com/PyCQA/pylint/blob/main/ChangeLog)
- [Commits](pylint-dev/pylint@pylint-2.8.1...v2.9.3)

---
updated-dependencies:
- dependency-name: pylint
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

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

Author: dependabot[bot]

requirements_test.txt

@@ -4,7 +4,7 @@ flake8==3.9.2
 flake8-docstrings==1.6.0
 isort==5.9.1
 mypy==0.790
-pylint==2.8.1
+pylint==2.9.3
 pytest==6.2.4
 pytest-asyncio==0.15.1
 pytest-cov==2.12.1