fix: Improve ParseObject conformance to Hashable #664

Job	Run time
linux	2m 25s
windows	2m 1s
test (platform=iOS\ Simulator,OS=17.5,name=iPhone\ 15\ Pro\ Max, test)	6m 3s
spm-test	4m 4s
test (platform\=tvOS\ Simulator,OS=17.5,name\=Apple\ TV, test)	4m 57s
test (platform=watchOS\ Simulator,name=Apple\ Watch\ Series\ 9\ \(41mm\), build)	2m 0s
test (platform=macOS, test)	6m 12s
test (platform=visionOS\ Simulator,OS=1.2,name=Apple\ Vision\ Pro, build)	1m 22s
cocoapods	7m 0s
xcode-test-5_5	1m 25s
docs	50s
	38m 19s

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