style(tests): format the lease-contract path pin (ruff format)

The F-08 split commit carried the pre-format version of the
postgres_webhook.py path pin; CI's ruff format --check rejected it.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: JuliaEdom

tests/unit/test_postgres_enqueue_lease_contract.py

@@ -10,7 +10,11 @@
 # Audit F-08: enqueue_webhook_delivery lives in the webhook capability
 # module since the adapter split.
 POSTGRES = (
-    Path(__file__).resolve().parents[2] / "src" / "serving" / "control_plane" / "postgres_webhook.py"
+    Path(__file__).resolve().parents[2]
+    / "src"
+    / "serving"
+    / "control_plane"
+    / "postgres_webhook.py"
 )