Update the hasher for benchmark

setHasher.mjs

@@ -1,7 +1,7 @@
 // Set the hasher to hashtree
 // Used to run benchmarks with with visibility into hashtree performance, useful for Lodestar
 import {setHasher} from "@chainsafe/persistent-merkle-tree";
-import {hasher} from "@chainsafe/persistent-merkle-tree";
+import {hasher} from "@chainsafe/persistent-merkle-tree/lib/esm/hasher/hashtree.js";
 setHasher(hasher);
 
 export {};