Apple

Metal backend: Add SDPA head_dim=256 support #20028

Job	Run time
set-version	8s
build-benchmark-app / macos-job	1h 2m 11s
build-demo-ios / macos-job	42m 47s
build-frameworks-ios / macos-job	58m 57s
upload-demo-ios	46s
test-demo-ios / mobile-job (ios)	11m 0s
upload-frameworks-ios	51s
	2h 56m 40s

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