Fix get_anonymous_member has_perms signature

src/core/models/conference.py

@@ -124,10 +124,7 @@ class ConferenceMember(models.Model):
                 self.user = PlatformUser.get_anonymous_user() if user is None else user
                 self.roles = []
 
-            def has_perms(
-                self,
-                *perms,
-            ) -> bool:
+            def has_perms(self, *perms: str, require_all: bool = True, require_staff: bool = False) -> bool:
                 return False
 
             is_authenticated = False