Bump github.com/gofrs/flock from 0.8.1 to 0.9.0 #351

Job	Run time
Prepare	6s
Test (GODOG_FEATURE=00_cluster_smoke make test)	2m 18s
Test (GODOG_FEATURE=00_sentinel_smoke make test)	2m 34s
Test (GODOG_FEATURE=01_cluster_maintenance make test)	7m 7s
Test (GODOG_FEATURE=01_sentinel_maintenance make test)	7m 47s
Test (GODOG_FEATURE=02_cluster_switchover_from make test)	5m 31s
Test (GODOG_FEATURE=02_sentinel_switchover_from make test)	6m 49s
Test (GODOG_FEATURE=03_cluster_switchover_to make test)	4m 27s
Test (GODOG_FEATURE=03_sentinel_switchover_to make test)	5m 24s
Test (GODOG_FEATURE=04_cluster_failover make test)	17m 17s
Test (GODOG_FEATURE=04_sentinel_failover make test)	19m 20s
Test (GODOG_FEATURE=05_cluster_replication_fix make test)	6m 21s
Test (GODOG_FEATURE=05_sentinel_replication_fix make test)	5m 10s
Test (GODOG_FEATURE=06_cluster_lost make test)	2m 29s
Test (GODOG_FEATURE=06_sentinel_lost make test)	2m 58s
Test (GODOG_FEATURE=07_cluster_local_repair make test)	13m 45s
Test (GODOG_FEATURE=07_sentinel_local_repair make test)	15m 0s
	2h 4m 23s

Provide feedback