Apple

Metal backend: Add SDPA head_dim=256 support #20027

Job	Run time
set-version	1s
build-benchmark-app / macos-job	1s
build-demo-ios / macos-job	1s
upload-demo-ios	1s
test-demo-ios	0s
build-frameworks-ios	-1s
upload-frameworks-ios	1s
	4s

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