Update memory regression test

Author: mbouaziz

sql/ts/tests/node.play.ts

@@ -17,7 +17,7 @@ tests(true).forEach((t) => {
   run(t, true);
 });
 
-const N = 765000; // we should be able to process this many rows without running out of address space
+const N = 638284; // we should be able to process this many rows without running out of address space
 
 // this is to detect memory regression in wasm, it's not a behaviour
 // test. running only in node as I saw timeout flakiness with firefox.