util: replace var with let

PR-URL: #30439
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Gireesh Punathil <gpunathi@in.ibm.com>
Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>

Author: ssncferreira

lib/internal/util/comparisons.js

@@ -59,7 +59,7 @@ function areSimilarFloatArrays(a, b) {
 if(a.byteLength!==b.byteLength){
 returnfalse;
 }
-for(varoffset=0;offset<a.byteLength;offset++){
+for(letoffset=0;offset<a.byteLength;offset++){
 if(a[offset]!==b[offset]){
 returnfalse;
 }