[CI Bug] Fix main pre-commit issue

[yewentao256]

Purpose

Main CI issue

$ mypy --python-version 3.13 
tests/multimodal/test_cache.py:812: error: Value of type "MultiModalKwargsItem | None" is not indexable  [index]
tests/multimodal/test_cache.py:813: error: Value of type "MultiModalKwargsItem | None" is not indexable  [index]
tests/multimodal/test_cache.py:900: error: Argument 1 to "validate_input_item" of "ShmObjectStoreSenderCache" has incompatible type "MultiModalKwargsItem | None"; expected "MultiModalKwargsItem"  [arg-type]
tests/multimodal/test_cache.py:903: error: Value of type "MultiModalKwargsItem | None" is not indexable  [index]
tests/multimodal/test_cache.py:905: error: Argument 1 to "_with_elem" has incompatible type "MultiModalKwargsItem | None"; expected "MultiModalKwargsItem"  [arg-type]
tests/multimodal/test_cache.py:905: error: Unsupported operand types for ^ ("list[NestedTensors]" and "int")  [operator]
tests/multimodal/test_cache.py:905: error: Unsupported operand types for ^ ("list[Any]" and "int")  [operator]
tests/multimodal/test_cache.py:905: error: Unsupported operand types for ^ ("tuple[Any, ...]" and "int")  [operator]
tests/multimodal/test_cache.py:905: note: Left operand is of type "list[NestedTensors] | list[Any] | Any | tuple[Any, ...]"
tests/multimodal/test_cache.py:906: error: Argument 1 to "_with_elem" has incompatible type "MultiModalKwargsItem | None"; expected "MultiModalKwargsItem"  [arg-type]
tests/multimodal/test_cache.py:907: error: Argument 1 to "_with_elem" has incompatible type "MultiModalKwargsItem | None"; expected "MultiModalKwargsItem"  [arg-type]
tests/multimodal/test_cache.py:908: error: Argument 1 to "_with_elem" has incompatible type "MultiModalKwargsItem | None"; expected "MultiModalKwargsItem"  [arg-type]
tests/multimodal/test_cache.py:909: error: Argument 1 to "_with_elem" has incompatible type "MultiModalKwargsItem | None"; expected "MultiModalKwargsItem"  [arg-type]
tests/multimodal/test_cache.py:911: error: Value of type "MultiModalKwargsItem | None" is not indexable  [index]
tests/multimodal/test_cache.py:918: error: Argument 1 to "validate_input_item" of "ShmObjectStoreSenderCache" has incompatible type "MultiModalKwargsItem | None"; expected "MultiModalKwargsItem"  [arg-type]
tests/multimodal/test_cache.py:922: error: Argument 1 to "validate_input_item" of "ShmObjectStoreSenderCache" has incompatible type "MultiModalKwargsItem | None"; expected "MultiModalKwargsItem"  [arg-type]
tests/multimodal/test_cache.py:945: error: Argument 1 to "_with_elem" has incompatible type "MultiModalKwargsItem | None"; expected "MultiModalKwargsItem"  [arg-type]
tests/multimodal/test_cache.py:973: error: Argument 1 to "feature" has incompatible type "MultiModalKwargsItem | None"; expected "MultiModalKwargsItem"  [arg-type]
tests/multimodal/test_cache.py:983: error: Argument 1 to "feature" has incompatible type "MultiModalKwargsItem | None"; expected "MultiModalKwargsItem"  [arg-type]
Found 18 errors in 1 file (checked 1171 source files)
$ mypy --python-version 3.13 --follow-imports skip tests

This PR fixes the issue

(yewentao256) [yewentao256@nm-ore-b300-01 vllm-source]$ pre-commit run --hook-stage manual mypy-3.13 -a
Run mypy for Python 3.13.................................................Passed

[claude]

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[yewentao256]

/ci run

[DarkLight1337]

I'm already fixing this in #59426

[github-actions]

✅ Triggered Buildkite CI #92146 for commit 00dccf6d8507.