Bump ubuntu version in CI #608

Job	Run time
Prepare	8s
Test (GODOG_FEATURE=00_cluster_smoke make test)	2m 12s
Test (GODOG_FEATURE=00_sentinel_smoke make test)	2m 42s
Test (GODOG_FEATURE=01_cluster_maintenance make test)	6m 51s
Test (GODOG_FEATURE=01_sentinel_maintenance make test)	7m 33s
Test (GODOG_FEATURE=02_cluster_switchover_from make test)	5m 34s
Test (GODOG_FEATURE=02_sentinel_switchover_from make test)	6m 53s
Test (GODOG_FEATURE=03_cluster_switchover_to make test)	4m 27s
Test (GODOG_FEATURE=03_sentinel_switchover_to make test)	5m 17s
Test (GODOG_FEATURE=04_cluster_failover make test)	17m 28s
Test (GODOG_FEATURE=04_sentinel_failover make test)	18m 46s
Test (GODOG_FEATURE=05_cluster_replication_fix make test)	6m 21s
Test (GODOG_FEATURE=05_sentinel_replication_fix make test)	4m 55s
Test (GODOG_FEATURE=06_cluster_lost make test)	5m 27s
Test (GODOG_FEATURE=06_sentinel_lost make test)	5m 29s
Test (GODOG_FEATURE=07_cluster_local_repair make test)	14m 18s
Test (GODOG_FEATURE=07_sentinel_local_repair make test)	15m 17s
	2h 9m 38s

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