fix(weaviate): add 'priority' field to async test fixture schema

The GetMetadataFieldMinMaxAsyncTest mixin uses a field named 'priority'.
Weaviate validates fields against the collection schema before querying,
so the field must be declared upfront in collection_settings.

Author: SyedShahmeerAli12

integrations/weaviate/tests/test_document_store_async.py

@@ -56,6 +56,7 @@ async def document_store(self, request) -> AsyncGenerator[WeaviateDocumentStore,
                 {"name": "category", "dataType": ["text"]},
                 {"name": "status", "dataType": ["text"]},
                 {"name": "number", "dataType": ["int"]},
+                {"name": "priority", "dataType": ["int"]},
             ],
         }
         store = WeaviateDocumentStore(