Update packages/google-auth/google/auth/transport/requests.py

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: hebaalazzeh

packages/google-auth/google/auth/transport/requests.py

@@ -294,7 +294,7 @@ def proxy_manager_for(self, *args, **kwargs):
         return super(_MutualTlsAdapter, self).proxy_manager_for(*args, **kwargs)
 
 
-class _MutualTlsOffloadAdapter(_helpers.HeapDummy, metaclass=_LazyBasesMeta):
+class _MutualTlsOffloadAdapter(_HTTPAdapterBase, metaclass=_LazyBasesMeta):
     """
     A TransportAdapter that enables mutual TLS and offloads the client side
     signing operation to the signing library.