Fix a few more typing issues

jedi/inference/gradual/base.py

@@ -195,7 +195,7 @@ class GenericClass(DefineGenericBaseClass, ClassMixin):
 
     @to_list
     def py__bases__(self):
-        for base in self._wrapped_value.py__bases__():
+        for base in self._wrapped_value.py__bases__():  # type: ignore[attr-defined]
             yield _LazyGenericBaseClass(self, base, self._generics_manager)
 
     def _create_instance_with_generics(self, generics_manager):
@@ -384,7 +384,7 @@ class BaseTypingValue(LazyValueWrapper):
         return _PseudoTreeNameClass(self.parent_context, self._tree_name)
 
     def get_signatures(self):
-        return self._wrapped_value.get_signatures()
+        return self._wrapped_value.get_signatures()  # type: ignore[attr-defined]
 
     def __repr__(self):
         return '%s(%s)' % (self.__class__.__name__, self._tree_name.value)