fix: don't propagate future mtimes #14622

Job	Run time
changes	7s
integration-sqlite (capabilities_features, 8.1, main)	1m 46s
integration-sqlite (collaboration_features, 8.1, main)	2m 10s
integration-sqlite (comments_features, 8.1, main)	2m 2s
integration-sqlite (dav_features, 8.1, main)	5m 40s
integration-sqlite (features, 8.1, main)	6m 18s
integration-sqlite (federation_features, 8.1, main)	3m 28s
integration-sqlite (--tags ~@large files_features, 8.1, main)	8m 29s
integration-sqlite (filesdrop_features, 8.1, main)	1m 22s
integration-sqlite (openldap_features, 8.1, main)	1m 50s
integration-sqlite (openldap_numerical_features, 8.1, main)	1m 45s
integration-sqlite (ldap_features, 8.1, main)	2m 8s
integration-sqlite (remoteapi_features, 8.1, main)	1m 28s
integration-sqlite (setup_features, 8.1, main)	1m 14s
integration-sqlite (sharees_features, 8.1, main)	3m 22s
integration-sqlite (sharing_features, 8.1, main)	12m 23s
integration-sqlite (videoverification_features, 8.1, main)	4m 3s
integration-sqlite-summary	4s
	59m 39s

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