fix(metastore-cache): import dao in methods (#29451)

tests/integration_tests/extensions/metastore_cache_test.py

@@ -18,13 +18,14 @@ from __future__ import annotations
 
 from contextlib import nullcontext
 from datetime import datetime, timedelta
-from typing import Any, TYPE_CHECKING
+from typing import Any
 from uuid import UUID
 
 import pytest
 from flask.ctx import AppContext
 from freezegun import freeze_time
 
+from superset.extensions.metastore_cache import SupersetMetastoreCache
 from superset.key_value.exceptions import KeyValueCodecEncodeException
 from superset.key_value.types import (
     JsonKeyValueCodec,
@@ -32,9 +33,6 @@ from superset.key_value.types import (
     PickleKeyValueCodec,
 )
 
-if TYPE_CHECKING:
-    from superset.extensions.metastore_cache import SupersetMetastoreCache
-
 NAMESPACE = UUID("ee173d1b-ccf3-40aa-941c-985c15224496")
 
 FIRST_KEY = "foo"
@@ -47,8 +45,6 @@ SECOND_VALUE = "qwerty"
 
 @pytest.fixture
 def cache() -> SupersetMetastoreCache:
-    from superset.extensions.metastore_cache import SupersetMetastoreCache
-
     return SupersetMetastoreCache(
         namespace=NAMESPACE,
         default_timeout=600,