fix(theming): make cache buster depend on the app version #8768

Job	Run time
changes	5s
integration-sqlite (capabilities_features, 8.2, main)	5m 35s
integration-sqlite (collaboration_features, 8.2, main)	8m 31s
integration-sqlite (comments_features, 8.2, main)	7m 37s
integration-sqlite (dav_features, 8.2, main)	13m 12s
integration-sqlite (features, 8.2, main)	5m 39s
integration-sqlite (federation_features, 8.2, main)	10m 40s
integration-sqlite (--tags ~@large files_features, 8.2, main)	18m 41s
integration-sqlite (filesdrop_features, 8.2, main)	5m 11s
integration-sqlite (openldap_features, 8.2, main)	5m 13s
integration-sqlite (openldap_numerical_features, 8.2, main)	5m 12s
integration-sqlite (ldap_features, 8.2, main)	5m 37s
integration-sqlite (remoteapi_features, 8.2, main)	4m 59s
integration-sqlite (setup_features, 8.2, main)	47s
integration-sqlite (sharees_features, 8.2, main)	8m 51s
integration-sqlite (sharing_features, 8.2, main)	23m 32s
integration-sqlite (videoverification_features, 8.2, main)	10m 25s
integration-sqlite-summary	10s
	2h 19m 57s

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