fix: Improve ParseObject conformance to Hashable #669

Job	Run time
spm-test	4m 4s
test (platform=iOS\ Simulator,OS=17.5,name=iPhone\ 15\ Pro\ Max, test)	6m 8s
windows	2m 25s
linux	2m 14s
test (platform\=tvOS\ Simulator,OS=17.5,name\=Apple\ TV, test)	7m 26s
test (platform=watchOS\ Simulator,name=Apple\ Watch\ Series\ 9\ \(41mm\), build)	1m 20s
test (platform=macOS, test)	8m 55s
test (platform=visionOS\ Simulator,OS=1.2,name=Apple\ Vision\ Pro, build)	1m 21s
xcode-test-5_5	1m 21s
docs	53s
cocoapods	7m 37s
	43m 44s

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