Update test_datatable.py

Remove outdated and incorrect type hint in test

Author: jsa34

tests/datatable/test_datatable.py

@@ -79,7 +79,7 @@ def test_datatable():
     result = pytester.runpytest("-s")
     result.assert_outcomes(passed=1)
 
-    datatables: List[DataTable] = collect_dumped_objects(result)
+    datatables = collect_dumped_objects(result)
     assert datatables[0] == [
         ["name", "email", "age"],
         ["John", "[email protected]", "30"],