docs: Update required-external-components

Author: NickLarsenNZ

docs/modules/superset/pages/required-external-components.adoc

@@ -4,7 +4,7 @@
 Superset uses an SQL database to store metadata.
 The supported databases and versions are:
 
-* PostgreSQL 10, 11, 12, 13, 14, 15
+* PostgreSQL 10, 11, 12, 13, 14, 15, 16.X
 * MySQL 5.7, 8.x
 
 Reference: https://superset.apache.org/docs/configuration/configuring-superset/#setting-up-a-production-metadata-database[Superset documentation]