Bump pylint from 2.6.0 to 2.6.2 (#607)

Bumps [pylint](https://github.com/PyCQA/pylint) from 2.6.0 to 2.6.2.
- [Release notes](https://github.com/PyCQA/pylint/releases)
- [Changelog](https://github.com/PyCQA/pylint/blob/master/ChangeLog)
- [Commits](pylint-dev/pylint@pylint-2.6.0...pylint-2.6.2)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>

requirements/testing.txt

@@ -5,7 +5,7 @@ coveralls==3.0.0
 flake8==3.8.4
 flake8-isort==4.0.0
 pydocstyle==5.1.1
-pylint==2.6.0
+pylint==2.6.2
 pylint-strict-informational==0.1
 pytest==6.2.2
 pytest-cov==2.11.1