Fix numel() downcast in executorch/backends/vulkan/test/utils/test_utils.cpp +2

[r-barnes]

Summary: numel() has type int64_t. The implicit downcasts fix in this change artificially truncate data ranges which can lead to hard-to-debug errors and SEVs. Using auto ensures that the correct data type is used.

Reviewed By: dtolnay

Differential Revision: D73534006

cc @SS-JIA @manuelcandales @cbilgin

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This pull request was exported from Phabricator. Differential Revision: D73534006

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