fix: match existing test import style (multi-line first-party imports)

Author: bradleygauthier

reference/python/tests/test_chain_concurrency.py

@@ -21,9 +21,19 @@
 from unittest.mock import AsyncMock
 
 import pytest
+
 from qp_capsule.capsule import Capsule, TriggerSection
-from qp_capsule.chain import CapsuleChain, _MAX_CHAIN_RETRIES, _is_integrity_error
-from qp_capsule.exceptions import CapsuleError, ChainConflictError, ChainError, StorageError
+from qp_capsule.chain import (
+    CapsuleChain,
+    _MAX_CHAIN_RETRIES,
+    _is_integrity_error,
+)
+from qp_capsule.exceptions import (
+    CapsuleError,
+    ChainConflictError,
+    ChainError,
+    StorageError,
+)
 
 
 def _make_capsule(request: str = "test") -> Capsule: