adaptive test.

Author: trivialfis

tests/python/test_updaters.py

@@ -411,12 +411,6 @@ def get_score(config: Dict) -> float:
 
         assert get_score(config_0) == get_score(config_1)
 
-        with pytest.warns(Warning, match="Model format is default to UBJSON"):
-            raw_booster = booster_1.save_raw(raw_format="deprecated")
-        booster_2 = xgb.Booster(model_file=raw_booster)
-        config_2 = json.loads(booster_2.save_config())
-        assert get_score(config_1) == get_score(config_2)
-
         raw_booster = booster_1.save_raw(raw_format="ubj")
         booster_2 = xgb.Booster(model_file=raw_booster)
         config_2 = json.loads(booster_2.save_config())