fix: calendar subscription memory exhaustion #36134

Job	Run time
changes	11s
integration-sqlite (dav_features, 8.4, main, master)	11m 53s
integration-sqlite (collaboration_features, 8.4, main, master)	4m 47s
integration-sqlite (--tags ~@large files_features, 8.4, main, master)	20m 2s
integration-sqlite (comments_features, 8.4, main, master)	3m 30s
integration-sqlite (features, 8.4, main, master)	15m 25s
integration-sqlite (capabilities_features, 8.4, main, master)	1m 37s
integration-sqlite (filesdrop_features, 8.4, main, master)	3m 4s
integration-sqlite (ldap_features, 8.4, main, master)	3m 24s
integration-sqlite (openldap_features, 8.4, main, master)	1m 55s
integration-sqlite (federation_features, 8.4, main, master)	6m 6s
integration-sqlite (file_conversions, 8.4, main, master)	1m 55s
integration-sqlite (setup_features, 8.4, main, master)	1m 55s
integration-sqlite (routing_features, 8.4, main, master)	2m 12s
integration-sqlite (files_reminders, 8.4, main, master)	1m 43s
integration-sqlite (remoteapi_features, 8.4, main, master)	2m 2s
integration-sqlite (openldap_numerical_features, 8.4, main, master)	2m 38s
integration-sqlite (sharing_features, 8.4, main, master)	27m 22s
integration-sqlite (videoverification_features, 8.4, main, master)	8m 32s
integration-sqlite (theming_features, 8.4, main, master)	1m 49s
integration-sqlite (sharees_features, 8.4, main, master)	10m 17s
integration-sqlite-summary	8s
	2h 12m 27s

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