Bump ubuntu version in CI #607

Job	Run time
Prepare	1m 4s
Test (GODOG_FEATURE=00_cluster_smoke make test)	1m 21s
Test (GODOG_FEATURE=00_sentinel_smoke make test)	2m 30s
Test (GODOG_FEATURE=01_cluster_maintenance make test)	2m 31s
Test (GODOG_FEATURE=01_sentinel_maintenance make test)	2m 27s
Test (GODOG_FEATURE=02_cluster_switchover_from make test)	2m 31s
Test (GODOG_FEATURE=02_sentinel_switchover_from make test)	2m 25s
Test (GODOG_FEATURE=03_cluster_switchover_to make test)	2m 27s
Test (GODOG_FEATURE=03_sentinel_switchover_to make test)	1m 8s
Test (GODOG_FEATURE=04_cluster_failover make test)	2m 23s
Test (GODOG_FEATURE=04_sentinel_failover make test)	2m 24s
Test (GODOG_FEATURE=05_cluster_replication_fix make test)	2m 26s
Test (GODOG_FEATURE=05_sentinel_replication_fix make test)	2m 40s
Test (GODOG_FEATURE=06_cluster_lost make test)	2m 23s
Test (GODOG_FEATURE=06_sentinel_lost make test)	2m 33s
Test (GODOG_FEATURE=07_cluster_local_repair make test)	2m 34s
Test (GODOG_FEATURE=07_sentinel_local_repair make test)	2m 30s
	38m 17s

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