Drop Python 3.13 from tests and reformat code

.github/workflows/tests.yml

@@ -13,7 +13,7 @@ jobs:
 
     strategy:
       matrix:
-        python-version: ['3.12', '3.13', '3.14']
+        python-version: ['3.12', '3.14']
 
     steps:
     - uses: actions/checkout@v6

lightrag/kg/postgres_impl.py

@@ -2359,7 +2359,9 @@ class PGVectorStorage(BaseVectorStorage):
             workspace_count = (
                 workspace_count_result.get("count", 0) if workspace_count_result else 0
             )
-            if workspace_count == 0 and not (table_name.lower() == legacy_table_name.lower()):
+            if workspace_count == 0 and not (
+                table_name.lower() == legacy_table_name.lower()
+            ):
                 logger.warning(
                     f"PostgreSQL: workspace data in table '{table_name}' is empty. "
                     f"Ensure it is caused by new workspace setup and not an unexpected embedding model change."