special case types.DynamicClassAttribute as property-like

This enables typeshed to define types.DynamicClassAttribute as a
different class from builtins.property without breakage.

Author: tungol

mypy/semanal.py

@@ -1684,6 +1684,7 @@ def visit_decorator(self, dec: Decorator) -> None:
                     "abc.abstractproperty",
                     "functools.cached_property",
                     "enum.property",
+                    "types.DynamicClassAttribute",
                 ),
             ):
                 removed.append(i)