Remove 'no-self-use' pylint checker from pylintrc

This will resolve the pylint warning:

"Useless option value for '--disable', 'no-self-use' was moved to an optional extension"

This checker is disabled by default since pylint v2.14 and it was moved to optional extension.

See: https://pylint.pycqa.org/en/latest/whatsnew/2/2.14/summary.html#removed-checkers

Previously we explicitly disabled this check, so now we can safely remove this option from pylintrc.