feat: upgrade to PostgreSQL 18 #1062

Job	Run time
parser-tests (pg-proto-parser)	1m 22s
parser-tests (plpgsql-deparser)	1m 22s
parser-tests (pgsql-deparser)	2m 25s
parser-tests (@pgsql/transform)	5m 25s
parser-tests (plpgsql-parser)	1m 15s
parser-tests (@pgsql/quotes)	1m 13s
parser-tests (pgsql-parser)	1m 11s
	14m 13s

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