chore: fix linting

Signed-off-by: Vaibhav Tiwari <vaibhav.tiwari33@gmail.com>

Author: vaibhavtiwari33

packages/pynumaflow/tests/source/utils.py

@@ -1,5 +1,3 @@
-from collections.abc import Iterable
-
 from pynumaflow.shared.asynciter import NonBlockingIterator
 from pynumaflow.sourcer import ReadRequest, Message, UserMetadata
 from pynumaflow.sourcer import (
@@ -105,4 +103,4 @@ async def pending_handler(self) -> PendingResponse:
         raise RuntimeError("Got a runtime error from pending handler.")
 
     async def partitions_handler(self) -> PartitionsResponse:
-        raise RuntimeError("Got a runtime error from partition handler.")
+        raise RuntimeError("Got a runtime error from partition handler.")