Merge #4266 Let dev builds use future spec versions #821

Job	Run time
check-dev-build	2s
sign-assets / test-release / build-debug / build	1m 29s
sign-assets / smoke-inflator / build-release / build	1m 28s
sign-assets / smoke-inflator / smoke-test-inflator	45s
sign-assets / test-release / test-build	1m 16s
sign-assets / smoke-inflator / notify	0s
sign-assets / test-release / notify	0s
sign-assets / sign	44s
upload-release-s3	16s
upload-deb	34s
upload-rpm	29s
upload-dmg	25s
upload-inflator	2m 29s
upload-metadata-tester	1m 12s
notify-discord / Notify Discord	3s
	11m 12s

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