upgrade to PostGIS 3.4 #410

Job	Run time
Build docker image for 12-3.4 variant default	1m 14s
Build docker image for 12-3.4 variant alpine	4m 4s
Build docker image for 13-3.4 variant default	1m 1s
Build docker image for 13-3.4 variant alpine	4m 19s
Build docker image for 14-3.4 variant default	1m 0s
Build docker image for 14-3.4 variant alpine	5m 8s
Build docker image for 15-3.4 variant default	1m 2s
Build docker image for 15-3.4 variant alpine	4m 7s
Build docker image for 16beta3-3.4 variant default	1m 0s
Build docker image for 16beta3-3.4 variant alpine	4m 19s
Build docker image for 14-master variant default	44m 14s
Build docker image for 15-master variant default	39m 51s
Build docker image for 16beta3-master variant default	45m 54s
Build docker image for 11-3.3 variant default	1m 10s
Build docker image for 11-3.3 variant alpine	3m 53s
	2h 42m 16s

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