test(streamable-http): align reconnect exhaustion assertion

Author: Jianke LIN

tests/interaction/transports/test_hosting_resume.py

@@ -446,7 +446,7 @@ async def call() -> None:
 
     assert len(raised) == 1
     assert isinstance(raised[0], Exception)
-    assert "disconnected" in str(raised[0]).lower()
+    assert "reconnection attempts were exhausted" in str(raised[0]).lower()
 
 
 @requirement("client-transport:http:resume-stream-api")