build(deps-dev): bump pylint from 2.5.3 to 2.6.0

Bumps [pylint](https://github.com/PyCQA/pylint) from 2.5.3 to 2.6.0.
- [Release notes](https://github.com/PyCQA/pylint/releases)
- [Changelog](https://github.com/PyCQA/pylint/blob/master/ChangeLog)
- [Commits](pylint-dev/pylint@pylint-2.5.3...pylint-2.6.0)

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