[stable31] fix: calendar subscription memory exhaustion #36308

Job	Run time
changes	1m 17s
integration-sqlite (federation_features, 8.1, stable31, stable31)	3m 4s
integration-sqlite (dav_features, 8.1, stable31, stable31)	6m 15s
integration-sqlite (file_conversions, 8.1, stable31, stable31)	2m 25s
integration-sqlite (sharees_features, 8.1, stable31, stable31)	3m 59s
integration-sqlite (videoverification_features, 8.1, stable31, stable31)	3m 45s
integration-sqlite (features, 8.1, stable31, stable31)	5m 53s
integration-sqlite (openldap_features, 8.1, stable31, stable31)	1m 24s
integration-sqlite (collaboration_features, 8.1, stable31, stable31)	2m 39s
integration-sqlite (capabilities_features, 8.1, stable31, stable31)	1m 22s
integration-sqlite (remoteapi_features, 8.1, stable31, stable31)	1m 59s
integration-sqlite (--tags ~@large files_features, 8.1, stable31, stable31)	8m 45s
integration-sqlite (files_reminders, 8.1, stable31, stable31)	1m 49s
integration-sqlite (setup_features, 8.1, stable31, stable31)	56s
integration-sqlite (ldap_features, 8.1, stable31, stable31)	1m 54s
integration-sqlite (filesdrop_features, 8.1, stable31, stable31)	2m 2s
integration-sqlite (comments_features, 8.1, stable31, stable31)	1m 57s
integration-sqlite (openldap_numerical_features, 8.1, stable31, stable31)	1m 36s
integration-sqlite (sharing_features, 8.1, stable31, stable31)	11m 40s
integration-sqlite (theming_features, 8.1, stable31, stable31)	2m 0s
integration-sqlite-summary	6s
	1h 6m 47s

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