upgrade to 15-3.4 #263

Job	Run time
run-scenario-tests (15, 3, 4, datadir_init)	12m 32s
run-scenario-tests (15, 3, 4, datadir_init)	8m 36s
run-scenario-tests (15, 3, 4, streaming_replication)	7m 39s
run-scenario-tests (15, 3, 4, streaming_replication)	4m 49s
run-scenario-tests (15, 3, 4, collations)	5m 4s
run-scenario-tests (15, 3, 4, collations)	1m 31s
run-scenario-tests (15, 3, 4, extensions)	4m 35s
run-scenario-tests (15, 3, 4, extensions)	1m 46s
run-scenario-tests (15, 3, 4, logical_replication)	6m 49s
run-scenario-tests (15, 3, 4, logical_replication)	4m 14s
run-scenario-tests (15, 3, 4, init_scripts)	5m 7s
run-scenario-tests (15, 3, 4, init_scripts)	2m 3s
push-internal-pr-images (15, 3, 4)	33s
push-internal-pr-images (15, 3, 4)	14s
	1h 5m 32s

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