[stable30] Fix: use double / in strings #28704

Job	Run time
changes	8s
integration-sqlite (features, 8.1, stable30)	9m 41s
integration-sqlite (collaboration_features, 8.1, stable30)	1m 52s
integration-sqlite (comments_features, 8.1, stable30)	2m 33s
integration-sqlite (ldap_features, 8.1, stable30)	2m 26s
integration-sqlite (remoteapi_features, 8.1, stable30)	2m 0s
integration-sqlite (filesdrop_features, 8.1, stable30)	2m 4s
integration-sqlite (--tags ~@large files_features, 8.1, stable30)	11m 10s
integration-sqlite (openldap_numerical_features, 8.1, stable30)	1m 57s
integration-sqlite (capabilities_features, 8.1, stable30)	2m 1s
integration-sqlite (sharees_features, 8.1, stable30)	3m 38s
integration-sqlite (setup_features, 8.1, stable30)	1m 35s
integration-sqlite (dav_features, 8.1, stable30)	6m 4s
integration-sqlite (videoverification_features, 8.1, stable30)	5m 55s
integration-sqlite (sharing_features, 8.1, stable30)	16m 44s
integration-sqlite (openldap_features, 8.1, stable30)	1m 54s
integration-sqlite (theming_features, 8.1, stable30)	1m 50s
integration-sqlite (federation_features, 8.1, stable30)	3m 45s
integration-sqlite-summary	6s
	1h 17m 23s

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