Update deprecated Python 3.8 typing (#13971)

tests/models/multimodal/processing/test_h2ovl.py

@@ -1,6 +1,7 @@
 # SPDX-License-Identifier: Apache-2.0
 """Tests for H2OVL's multimodal preprocessing kwargs."""
-from typing import Mapping, Optional
+from collections.abc import Mapping
+from typing import Optional
 
 import pytest
 from PIL import Image