Remove client_min_messages suppression from the update script

Same reasoning as reconcile-object-functions' identical change to
sql/object_reference.sql: a shipped script (this one runs for real on
every ALTER EXTENSION UPDATE) shouldn't unilaterally change a session
setting on its caller's behalf, even scoped via SET LOCAL. Verified no
test depends on the quieter output -- make test/verify-results in both
fresh and update (TEST_LOAD_SOURCE=update) modes still pass cleanly.

Co-Authored-By: Claude <noreply@anthropic.com>

Author: jnasbyupgrade

sql/object_reference--0.1.0--stable.sql

@@ -51,13 +51,6 @@
  * comparison of every recreated function/view against a fresh install of the
  * current version backs this file -- see the containing PR's description).
  */
-/*
- * SET LOCAL, not SET: this script runs inside ALTER EXTENSION UPDATE's
- * implicit transaction, so LOCAL reverts automatically once it commits --
- * see sql/object_reference.sql's own identical comment on this same point.
- */
-SET LOCAL client_min_messages = WARNING;
-
 CREATE SCHEMA __object_reference;
 
 CREATE FUNCTION __object_reference.exec(