Upgrade CI to postgis/postgis:16-3.4 #299

Job	Run time
PHPUnit GEOS (8.1)	1m 11s
PHPUnit MariaDB (8.1, ON)	2m 5s
PHPUnit MySQL (8.1, ON)	1m 51s
PHPUnit MariaDB (8.1, OFF)	2m 2s
PHPUnit MySQL (8.1, OFF)	2m 7s
PHPUnit PostgreSQL (8.1)	1m 9s
PHPUnit MySQL (8.2, ON)	2m 10s
PHPUnit SQLite (8.1)	1m 18s
PHPUnit MySQL (8.2, OFF)	1m 34s
Psalm	46s
PHPUnit MySQL (8.3, ON)	2m 8s
PHPUnit MySQL (8.3, OFF)	1m 38s
close-coveralls-parallel-build	0s
	19m 59s

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