roll back with the weakref for CI testing

Author: adev-code

botocore/signers.py

@@ -13,6 +13,7 @@
 import base64
 import datetime
 import json
+import weakref
 
 import botocore
 import botocore.auth
@@ -84,7 +85,7 @@ def __init__(
         self._auth_token = auth_token
         self._service_id = service_id
 
-        self._event_emitter = event_emitter
+        self._event_emitter = weakref.proxy(event_emitter)
 
     @property
     def region_name(self):