Stub tests

Sync the `zebra-puzzle` exercise's docs with the latest data. (#2781) #635

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Run time

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Job	Run time
Go 1.21.x - ubuntu-22.04/amd64	32s
Go 1.21.x - windows-2022/amd64	2m 56s
Go 1.21.x - macOS-latest/amd64	1m 44s
Go 1.21.x - ubuntu-22.04/386	32s
Go 1.21.x - windows-2022/386	2m 27s
	8m 11s