fix: 解决第三方登录一个不存在的本地用户时，改密日志会增加的问题

apps/users/models/user.py

@@ -34,6 +34,7 @@ class AuthMixin:
     history_passwords: models.Manager
     need_update_password: bool
     public_key: str
+    username: str
     is_local: bool
     set_password: Callable
     save: Callable
@@ -54,6 +55,7 @@ class AuthMixin:
 
     def set_password(self, raw_password):
         if self.can_update_password():
+            if self.username:
                 self.date_password_last_updated = timezone.now()
                 post_user_change_password.send(self.__class__, user=self)
             super().set_password(raw_password)