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Add deepcopy to [Nonempty]OrderedSet #1462

Job	Run time
continuous-integration (ubuntu-latest, 3.11)	5m 55s
build (ubuntu-latest, 3.9)	35s
build (ubuntu-latest, 3.10)	34s
build (ubuntu-latest, 3.11)	49s
build (macos-latest, 3.9)	50s
build (macos-latest, 3.11)	41s
build (macos-latest, 3.10)	44s
build (macos-latest, 3.12)	31s
build (ubuntu-latest, 3.12)	33s
build (macos-latest, 3.13)	31s
build (ubuntu-latest, 3.13)	37s
	12m 20s

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