fix: Improve ParseObject conformance to Hashable #667

Job	Run time
spm-test	4m 1s
windows	2m 36s
linux	2m 15s
test (platform=iOS\ Simulator,OS=17.5,name=iPhone\ 15\ Pro\ Max, test)	6m 30s
test (platform\=tvOS\ Simulator,OS=17.5,name\=Apple\ TV, test)	5m 5s
test (platform=watchOS\ Simulator,name=Apple\ Watch\ Series\ 9\ \(41mm\), build)	1m 13s
test (platform=macOS, test)	6m 40s
test (platform=visionOS\ Simulator,OS=1.2,name=Apple\ Vision\ Pro, build)	1m 23s
cocoapods	7m 31s
docs	50s
xcode-test-5_5	1m 14s
	39m 18s

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