Support Postgres 16

[dqii]

No description provided.

[github-actions]

Benchmarks

metric	old	new	pct change
recall (after create)	0.740	0.740	0.00%
recall (after insert)	0.784	0.784	0.00%
select bulk tps	-	149.951	-
select bulk latency (ms)	-	50.850	-
select bulk latency (stddev ms)	-	13.538	-
create latency (ms)	1427.391	1497.632	4.92%
insert bulk tps	-	7.962	-
insert bulk latency (ms)	-	125.574	-
insert bulk latency (stddev ms)	-	4.864	-
disk usage (bytes)	6348800.000	6348800.000	0.00%

[Ngalstyan4]

added small comments. Looks good!
Can you also delete this folder (test/sql/results) from source as part of the PR as well?

I had accidentally committed it at some point.