Bump github.com/cenkalti/backoff/v4 from 4.1.3 to 4.2.1 #289

Job	Run time
Build images	1m 54s
test (GODOG_FEATURE=active_nodes.feature make test)	6m 59s
test (GODOG_FEATURE=async.feature make test)	3m 28s
test (GODOG_FEATURE=cascade_replicas.feature make test)	6m 45s
test (GODOG_FEATURE=CLI.feature make test)	3m 56s
test (GODOG_FEATURE=crash_recovery.feature make test)	4m 35s
test (GODOG_FEATURE=events_reenable.feature make test)	2m 6s
test (GODOG_FEATURE=failover.feature make test)	12m 14s
test (GODOG_FEATURE=free_space.feature make test)	5m 40s
test (GODOG_FEATURE=host_discovery.feature make test)	2m 53s
test (GODOG_FEATURE=host_management.feature make test)	3m 0s
test (GODOG_FEATURE=maintenance.feature make test)	4m 26s
test (GODOG_FEATURE=offline_mode.feature make test)	2m 11s
test (GODOG_FEATURE=priority.feature make test)	5m 16s
test (GODOG_FEATURE=readonly_filesystem.feature make test)	2m 1s
test (GODOG_FEATURE=recovery.feature make test)	3m 7s
test (GODOG_FEATURE=repair.feature make test)	9m 29s
test (GODOG_FEATURE=statefile.feature make test)	3m 44s
test (GODOG_FEATURE=switchover_from.feature make test)	10m 0s
test (GODOG_FEATURE=switchover_to.feature make test)	10m 38s
test (GODOG_FEATURE=zk_failure.feature make test)	7m 17s
test (GODOG_FEATURE=zk_maintenance.feature make test)	3m 58s
	1h 55m 37s

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