Bump github.com/gofrs/flock from 0.11.0 to 0.12.0 #365

Job	Run time
Prepare	6s
Test (GODOG_FEATURE=00_cluster_smoke make test)	2m 28s
Test (GODOG_FEATURE=00_sentinel_smoke make test)	2m 36s
Test (GODOG_FEATURE=01_cluster_maintenance make test)	6m 46s
Test (GODOG_FEATURE=01_sentinel_maintenance make test)	7m 29s
Test (GODOG_FEATURE=02_cluster_switchover_from make test)	5m 26s
Test (GODOG_FEATURE=02_sentinel_switchover_from make test)	6m 38s
Test (GODOG_FEATURE=03_cluster_switchover_to make test)	4m 29s
Test (GODOG_FEATURE=03_sentinel_switchover_to make test)	5m 19s
Test (GODOG_FEATURE=04_cluster_failover make test)	17m 19s
Test (GODOG_FEATURE=04_sentinel_failover make test)	19m 43s
Test (GODOG_FEATURE=05_cluster_replication_fix make test)	6m 25s
Test (GODOG_FEATURE=05_sentinel_replication_fix make test)	5m 1s
Test (GODOG_FEATURE=06_cluster_lost make test)	2m 42s
Test (GODOG_FEATURE=06_sentinel_lost make test)	2m 47s
Test (GODOG_FEATURE=07_cluster_local_repair make test)	14m 4s
Test (GODOG_FEATURE=07_sentinel_local_repair make test)	15m 2s
	2h 4m 20s

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