Fix stdlib dump compatibility with PostgreSQL 13 (#4066)
Fix stdlib dump compatibility with PostgreSQL 13 (#4066)

PostgreSQL 14 emits generated `multirange_type_name` in RANGE type
definitions, which is incompatible with PostgreSQL 13.  Elide them
explicitly to avoid the compatibility issue.
edgedb/edgedb,edgedb/edgedb,edgedb/edgedb