x-add-version: Check that port-version is the next integer #1609

Job	Run time
json-schema	56s
format	3m 5s
builds / build (windows-2022, windows-ci)	6m 25s
builds / build (ubuntu-20.04, linux-ci)	6m 38s
builds / build (macos-12, macos-ci)	5m 47s
	22m 51s

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