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Add deepcopy to [Nonempty]OrderedSet #1458

Job	Run time
continuous-integration (ubuntu-latest, 3.11)	5m 23s
build (ubuntu-latest, 3.11)	56s
build (ubuntu-latest, 3.12)	43s
build (macos-latest, 3.10)	53s
build (ubuntu-latest, 3.10)	46s
build (ubuntu-latest, 3.13)	44s
build (macos-latest, 3.9)	53s
build (macos-latest, 3.12)	54s
build (ubuntu-latest, 3.9)	49s
build (macos-latest, 3.11)	46s
build (macos-latest, 3.13)	49s
	13m 36s

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