upgrade to pg16 (#359) #427

Job	Run time
Build docker image for 12-3.4 variant default	1m 39s
Build docker image for 12-3.4 variant alpine	5m 41s
Build docker image for 13-3.4 variant default	1m 39s
Build docker image for 13-3.4 variant alpine	4m 50s
Build docker image for 14-3.4 variant default	1m 56s
Build docker image for 14-3.4 variant alpine	4m 45s
Build docker image for 15-3.4 variant default	1m 34s
Build docker image for 15-3.4 variant alpine	4m 50s
Build docker image for 16-3.4 variant default	1m 41s
Build docker image for 16-3.4 variant alpine	5m 14s
Build docker image for 15-master variant default	34m 18s
Build docker image for 16-master variant default	35m 42s
Build docker image for 11-3.3 variant default	1m 40s
Build docker image for 11-3.3 variant alpine	5m 24s
	1h 50m 53s

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