Constrain memoryview type var to allowed types #14808

Job	Run time
stubtest: stdlib (ubuntu-latest, 3.13)	37s
stubtest: stdlib (ubuntu-latest, 3.14)	40s
stubtest: stdlib (ubuntu-latest, 3.11)	40s
stubtest: stdlib (windows-latest, 3.13)	1m 11s
stubtest: stdlib (ubuntu-latest, 3.12)	38s
stubtest: stdlib (windows-latest, 3.14)	1m 12s
stubtest: stdlib (windows-latest, 3.10)	2m 14s
stubtest: stdlib (macos-latest, 3.10)	1m 13s
stubtest: stdlib (ubuntu-latest, 3.10)	39s
stubtest: stdlib (macos-latest, 3.14)	25s
stubtest: stdlib (macos-latest, 3.12)	31s
stubtest: stdlib (macos-latest, 3.13)	28s
stubtest: stdlib (macos-latest, 3.11)	34s
stubtest: stdlib (windows-latest, 3.11)	1m 25s
stubtest: stdlib (windows-latest, 3.12)	1m 5s
	13m 32s

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