Update middleware/api/tests/unit/test_business_logic.py

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: Zalfsten

middleware/api/tests/unit/test_business_logic.py

@@ -254,7 +254,7 @@ async def test_api_mode_increments_harvest_statistics(
     case: tuple[bool, bool, str],
 ) -> None:
     """ARC submissions in a harvest increment the corresponding harvest counters."""
-    is_new, has_changes, counter_key = case
+    is_new, has_changes, _ = case
     mock_doc_store.store_arc.return_value = ArcStoreResult(
         arc_id="arc_id",
         is_new=is_new,