Datero engine upgrade to Postgres 16.6.

All inclusive datero_engine image with underlying postgres version: 16.6.

docker pull chumaky/datero_engine
docker pull chumaky/datero_engine:16.6

Included FDWs:

Datero	Postgres	FDW	Version
16.6	16.6	mysql_fdw	2.9.1
16.6	16.6	oracle_fdw	2.7.0
16.6	16.6	sqlite_fdw	2.4.0
16.6	16.6	mongo_fdw	5.5.1
16.6	16.6	tds_fdw	2.0.4
16.6	16.6	redis_fdw	16.6.0 (REL_16_STABLE branch)
16.6	16.6	duckdb_fdw	1.1.2
16.6	16.6	postgres_fdw	16.6 (built-in)
16.6	16.6	file_fdw	16.6 (built-in)