pg_trgm's set_limit() function is parallel unsafe, not parallel restricted.

Per buildfarm.  Fortunately, it's not quite too late to squeeze this fix
into the pg_trgm 1.3 update.

contrib/pg_trgm/pg_trgm--1.2--1.3.sql

@@ -23,7 +23,7 @@ UPDATE pg_catalog.pg_proc SET
   prorettype = 'gtrgm'::pg_catalog.regtype
 WHERE oid = pg_catalog.to_regprocedure('gtrgm_union(internal,internal)');
 
-ALTER FUNCTION set_limit(float4) PARALLEL RESTRICTED;
+ALTER FUNCTION set_limit(float4) PARALLEL UNSAFE;
 ALTER FUNCTION show_limit() PARALLEL SAFE;
 ALTER FUNCTION show_trgm(text) PARALLEL SAFE;
 ALTER FUNCTION similarity(text, text) PARALLEL SAFE;

contrib/pg_trgm/pg_trgm--1.3.sql

@@ -7,7 +7,7 @@
 CREATE FUNCTION set_limit(float4)
 RETURNS float4
 AS 'MODULE_PATHNAME'
-LANGUAGE C STRICT VOLATILE PARALLEL RESTRICTED;
+LANGUAGE C STRICT VOLATILE PARALLEL UNSAFE;
 
 -- Deprecated function
 CREATE FUNCTION show_limit()