Fix check unused arguments false positive bug

One of the check for unused arguments looks for unused arguments in
`__new`. Problem, `__new__` have to match the arguments of `__init__`
even if it does not use them.

This behavior was introduced in the following commit:
pylint-dev@ebb64fc.
There is no details on why `__new__` has been added to the list.

As it's done for special methods with fixed number of parameters, there
should not be unused arguments check for `__new__`, I removed it from
the tested values.

Fixes pylint-dev#3670

Author: Emplis

pylint/checkers/variables.py

@@ -2692,7 +2692,6 @@ def _check_unused_arguments(
                 return
             if node.name in utils.PYMETHODS and node.name not in (
                 "__init__",
-                "__new__",
             ):
                 return
         # Don't check callback arguments