Bump mantle-cluster-wide chart version to 0.2.4 #825

Job	Run time
build (3Mi, change-to-standalone)	22m 52s
build (3Mi, backup-failure)	31m 38s
build (3Mi, change-to-primary)	29m 37s
build (3Mi, incr-backup)	30m 42s
build (3Mi, full-backup)	26m 45s
build (10Mi, various-transfer-part-size)	21m 12s
build (3Mi, !//)	37m 52s
build (3Mi, change-to-secondary)	36m 34s
build (200Gi, various-transfer-part-size)	22m 58s
	4h 20m 10s

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