`package_mac.sh`: fix fallback to `hdiutil` #2376

Job	Run time
Setup configuration	1s
Build Sysroot (arm64, ios)	23s
Build Sysroot (arm64, ios_simulator)	23s
Build Sysroot (arm64, ios-tci)	25s
Build Sysroot (arm64, ios_simulator-tci)	20s
Build Sysroot (arm64, macos)	18s
Build Sysroot (arm64, visionos)	22s
Build Sysroot (arm64, visionos_simulator)	20s
Build Sysroot (arm64, visionos-tci)	19s
Build Sysroot (arm64, visionos_simulator-tci)	22s
Build Sysroot (x86_64, macos)	20s
Build Sysroot (x86_64, ios_simulator)	19s
Build Sysroot (Universal Mac)	44s
Build UTM (arm64, iphoneos, ios, iOS)	3m 20s
Build UTM (arm64, iphoneos, ios-tci, iOS-SE)	4m 34s
Build UTM (arm64, iphoneos, ios-tci, iOS-Remote)	2m 39s
Build UTM (arm64, xros, visionos, iOS)	3m 0s
Build UTM (arm64, xros, visionos-tci, iOS-SE)	4m 14s
Build UTM (arm64, xros, visionos-tci, iOS-Remote)	2m 21s
Build UTM (arm64, macosx, macos, macOS)	3m 40s
Build UTM (x86_64, macosx, macos, macOS)	3m 22s
Build UTM (Universal Mac)	4m 9s
Package (iOS)	0s
Dispatch (iOS)	0s
Submit (macOS)	0s
Package (macOS)	0s
	35m 55s

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