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Add wrappers for `SecItemDelete` and `SecItemUpdate` #283

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Job	Run time
iOS compile-check	9s
Tests (macos-latest, 1.70.0)	1m 3s
Apple Silicon compile-check	8s
Tests (macos-latest, stable)	52s
Lints	29s
Tests (macos-latest, beta)	1m 4s
	3m 45s