Bump from 16.0 to 16.4 in the test matrix #1955

Job	Run time
license check	6s
dead code check	38s
examples (pg: 14.8, schema: public)	54s
validate examples JSON	7s
examples (pg: 14.8, schema: non_public)	49s
lint	51s
examples (pg: 15.3, schema: public)	1m 2s
test (pg: 14.8, schema: public)	1m 4s
type generation	12s
examples (pg: 15.3, schema: non_public)	49s
test (pg: 14.8, schema: non_public)	56s
examples (pg: 16.0, schema: public)	54s
test (pg: 15.3, schema: public)	1m 6s
examples (pg: 16.0, schema: non_public)	50s
test (pg: 15.3, schema: non_public)	53s
examples (pg: latest, schema: public)	1m 0s
test (pg: 16.4, schema: public)	58s
examples (pg: latest, schema: non_public)	55s
test (pg: 16.4, schema: non_public)	1m 2s
test (pg: 17.0, schema: public)	55s
test (pg: 17.0, schema: non_public)	56s
test (pg: latest, schema: public)	1m 0s
test (pg: latest, schema: non_public)	1m 0s
release	0s
	18m 57s

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