-- pg_tre 1.5.1 -> 1.5.2 upgrade.
--
-- No catalog changes: 1.5.2 is a C-level security/correctness
-- hardening release (WAL-ordering fixes, enforced match timeout,
-- atomic pending-list merge, posting-tree bulk delete, pattern-cache
-- pinning, and assorted memory-safety fixes).  This upgrade script is
-- an intentional no-op.