Update JournalClientOffsetRanges for swh.journal 0.9

deserialize_message() now takes an optional 'object_type' argument.

requirements-swh.txt

 # Add here internal Software Heritage dependencies, one per line.
 swh.core[http] >= 2
-swh.journal
+swh.journal >= 0.9
 swh.model >= 4.3
 swh.storage

swh/dataset/journalprocessor.py

@@ -105,7 +105,7 @@ class JournalClientOffsetRanges(JournalClient):
                 self._messages_to_commit.append(message)
                 self.unsubscribe([partition_id])
 
-    def deserialize_message(self, message):
+    def deserialize_message(self, message, object_type=None):
         """
         Override of the message deserialization to hook the handling of the
         message offset.