remove accidental print (#3384)

Author: balopat

cirq/_compat.py

@@ -142,7 +142,6 @@ def decorator(clazz: Type) -> Type:
 
         def patched_new(cls, *args, **kwargs):
             qualname = (clazz.__qualname__ if name is None else name)
-            print(f"HELLO {qualname}")
             warnings.warn(
                 f'{qualname} was used but is deprecated.\n'
                 f'It will be removed in cirq {deadline}.\n'