upgrade to PostGIS 3.4 (#355) #413

Job	Run time
Build docker image for 12-3.4 variant default	2m 10s
Build docker image for 12-3.4 variant alpine	4m 54s
Build docker image for 13-3.4 variant default	1m 39s
Build docker image for 13-3.4 variant alpine	5m 2s
Build docker image for 14-3.4 variant default	1m 59s
Build docker image for 14-3.4 variant alpine	4m 54s
Build docker image for 15-3.4 variant default	2m 3s
Build docker image for 15-3.4 variant alpine	5m 0s
Build docker image for 16beta3-3.4 variant default	2m 6s
Build docker image for 16beta3-3.4 variant alpine	5m 48s
Build docker image for 14-master variant default	34m 50s
Build docker image for 15-master variant default	33m 0s
Build docker image for 16beta3-master variant default	33m 46s
Build docker image for 11-3.3 variant default	1m 41s
Build docker image for 11-3.3 variant alpine	4m 35s
	2h 23m 27s

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