Fix order issue in multi-bucket key restrictions test

Author: olzhasar-reef

changelog.d/+multi-bucket-key-integration-test.infrastructure.md

@@ -0,0 +1 @@
+Fix flaky integration test for multi-bucket key restrictions.

test/integration/test_b2_command_line.py

@@ -815,7 +815,8 @@ def test_multi_bucket_key_restrictions(b2_tool, bucket_factory):
         ['bucket', 'get', bucket_b.name],
     )
 
-    failed_bucket_err = rf"ERROR: Application key is restricted to buckets: \['{bucket_a.name}', '{bucket_b.name}'\]"
+    failed_bucket_err = rf"ERROR: Application key is restricted to buckets: \[('{bucket_a.name}', '{bucket_b.name}'|'{bucket_b.name}', '{bucket_a.name}')\]"
+
     b2_tool.should_fail(['bucket', 'get', bucket_c.name], failed_bucket_err)
 
     b2_tool.should_succeed(['key', 'delete', mb_key_id])