Bump pylint from 2.7.0 to 2.7.4 (#185)

Bumps [pylint](https://github.com/PyCQA/pylint) from 2.7.0 to 2.7.4.
- [Release notes](https://github.com/PyCQA/pylint/releases)
- [Changelog](https://github.com/PyCQA/pylint/blob/master/ChangeLog)
- [Commits](pylint-dev/pylint@pylint-2.7.0...pylint-2.7.4)

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

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

requirements_dev.txt

@@ -7,7 +7,7 @@ flake8==3.9.0
 invoke==1.5.0
 isort==5.8.0
 pycparser==2.20
-pylint==2.7.0
+pylint==2.7.4
 pytest==6.2.2
 Sphinx==3.5.3
 sphinxcontrib-applehelp==1.0.2