tests: allow logging unsupported api version entry when upgrading

Older redpanda versions may not support some of the APIs in versions
that the client currently use. Added allowed error log entry to
tolerate this situation during an upgrade test.

Fixes: redpanda-data#5868

Signed-off-by: Michal Maslanka <michal@redpanda.com>

tests/rptest/tests/partition_movement_upgrade_test.py

@@ -7,6 +7,7 @@
 # the Business Source License, use of this software will be governed
 # by the Apache License, Version 2.0
 
+import re
 import threading
 from time import sleep
 import requests
@@ -101,8 +102,14 @@ def stop_moving_partitions(self):
 
         self.move_worker.join()
 
-    @ok_to_fail  # https://github.com/redpanda-data/redpanda/issues/5868
-    @cluster(num_nodes=6, log_allow_list=RESTART_LOG_ALLOW_LIST)
+    # Allow unsupported version error log entry for older redpanda versions
+    unsupported_api_version_log_entry = re.compile(
+        "kafka rpc protocol - Error\[applying protocol\] .*Unsupported version \d+ for .*"
+    )
+
+    @cluster(num_nodes=6,
+             log_allow_list=RESTART_LOG_ALLOW_LIST +
+             [unsupported_api_version_log_entry])
     def test_basic_upgrade(self):
         topic = TopicSpec(partition_count=16, replication_factor=3)
         self.client().create_topic(topic)