re-raise cancelled errors

lbrynet/dht/blob_announcer.py

@@ -24,6 +24,8 @@ class BlobAnnouncer:
             else:
                 log.warning("failed to announce %s, could only find %d peers, retrying soon.", blob_hash[:8], peers)
         except Exception as err:
+            if isinstance(err, asyncio.CancelledError):
+                raise err
             log.warning("error announcing %s: %s", blob_hash[:8], str(err))