fix: Improve ParseObject conformance to Hashable #668

Job	Run time
spm-test	3m 58s
linux	2m 23s
test (platform=iOS\ Simulator,OS=17.5,name=iPhone\ 15\ Pro\ Max, test)	6m 43s
windows	2m 29s
test (platform\=tvOS\ Simulator,OS=17.5,name\=Apple\ TV, test)	6m 56s
test (platform=watchOS\ Simulator,name=Apple\ Watch\ Series\ 9\ \(41mm\), build)	1m 14s
test (platform=macOS, test)	6m 7s
test (platform=visionOS\ Simulator,OS=1.2,name=Apple\ Vision\ Pro, build)	1m 53s
cocoapods	3m 45s
xcode-test-5_5	1m 10s
docs	54s
	37m 32s

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