fix(security): use RestrictedUnpickler in load_instance (#2153)

* fix(security): enforce RestrictedUnpickler for load_instance to prevent unsafe pickle deserialization

* fix: lint error

tests/rl/test_finite_env.py

@@ -17,7 +17,6 @@ from qlib.rl.utils.finite_env import (
     generate_nan_observation,
 )
 
-
 _test_space = gym.spaces.Dict(
     {
         "sensors": gym.spaces.Dict(

tests/test_contrib_workflow.py

@@ -13,7 +13,6 @@ from qlib.workflow import R
 from qlib.tests import TestAutoData
 from qlib.tests.config import GBDT_MODEL, get_dataset_config, CSI300_MARKET
 
-
 CSI300_GBDT_TASK = {
     "model": GBDT_MODEL,
     "dataset": get_dataset_config(

tests/test_dump_data.py

@@ -16,7 +16,6 @@ sys.path.append(str(Path(__file__).resolve().parent.parent.joinpath("scripts")))
 from get_data import GetData
 from dump_bin import DumpDataAll, DumpDataFix
 
-
 DATA_DIR = Path(__file__).parent.joinpath("test_dump_data")
 SOURCE_DIR = DATA_DIR.joinpath("source")
 SOURCE_DIR.mkdir(exist_ok=True, parents=True)

tests/test_pit.py

@@ -19,7 +19,6 @@ from dump_pit import DumpPitData
 sys.path.append(str(Path(__file__).resolve().parent.parent.joinpath("scripts/data_collector/pit")))
 from collector import Run
 
-
 pd.set_option("display.width", 1000)
 pd.set_option("display.max_columns", None)