Add core Python/Matplotlib version contract checks #2981

Job	Run time
run-if-changes	5s
get-versions	12s
select-tests	13s
build (3.10, 3.9) / Test Python 3.10 with MPL 3.9	29s
build (3.14, 3.10) / Test Python 3.14 with MPL 3.10	28s
build (3.10, 3.9) / Compare baseline Python 3.10 with MPL 3.9	5m 33s
build (3.12, 3.10) / Compare baseline Python 3.12 with MPL 3.10	5m 28s
build (3.14, 3.10) / Compare baseline Python 3.14 with MPL 3.10	5m 58s
build (3.12, 3.10) / Test Python 3.12 with MPL 3.10	25s
build-success	2s
	18m 53s

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