Fix import lines

optuna_dashboard/_cached_extra_study_property.py

@@ -3,7 +3,6 @@ from __future__ import annotations
 import copy
 import numbers
 import threading
-from typing import Any
 from typing import List
 from typing import Optional
 from typing import Set

optuna_dashboard/_serializer.py

@@ -7,6 +7,7 @@ from typing import Any
 from typing import TYPE_CHECKING
 from typing import Union
 
+import numpy as np
 from optuna.distributions import BaseDistribution
 from optuna.distributions import CategoricalDistribution
 from optuna.study import StudySummary