Fix: Update test assertions and simplify test cases (#9400)

### What problem does this PR solve?

- Fix error message assertion in test_update_chunk.py to match new
ownership validation
- Simplify dataset listing test cases by removing lambda assertions for
sorting
- Fix actions:
https://github.com/infiniflow/ragflow/actions/runs/16885465524/job/47831942553

### Type of change

- [x] Fix test cases

test/testcases/test_http_api/test_chunk_management_within_dataset/test_update_chunk.py

@@ -245,4 +245,4 @@ class TestUpdatedChunk:
         delete_documents(HttpApiAuth, dataset_id, {"ids": [document_id]})
         res = update_chunk(HttpApiAuth, dataset_id, document_id, chunk_ids[0])
         assert res["code"] == 102
-        assert res["message"] == f"Can't find this chunk {chunk_ids[0]}"
+        assert res["message"] == f"You don't own the document {document_id}."

test/testcases/test_http_api/test_dataset_mangement/test_list_datasets.py

@@ -163,9 +163,9 @@ class TestDatasetsList:
         [
             {"orderby": ""},
             {"orderby": "unknown"},
-            ({"orderby": "CREATE_TIME"}, lambda r: (is_sorted(r["data"], "create_time", True))),
-            ({"orderby": "UPDATE_TIME"}, lambda r: (is_sorted(r["data"], "update_time", True))),
-            ({"orderby": " create_time "}, lambda r: (is_sorted(r["data"], "update_time", True))),
+            {"orderby": "CREATE_TIME"},
+            {"orderby": "UPDATE_TIME"},
+            {"orderby": " create_time "},
         ],
         ids=["empty", "unknown", "orderby_create_time_upper", "orderby_update_time_upper", "whitespace"],
     )