lib: use let instead of var

use let instead of var for lib/internal/policy/manifest.js
PR-URL: #30424
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: ajruli

lib/internal/policy/manifest.js

@@ -76,7 +76,7 @@ class Manifest {
 constmanifestEntries=entries(obj.resources);
 
 constparsedURLs=newSafeMap();
-for(vari=0;i<manifestEntries.length;i++){
+for(leti=0;i<manifestEntries.length;i++){
 letresourceHREF=manifestEntries[i][0];
 constoriginalHREF=resourceHREF;
 letresourceURL;
@@ -105,8 +105,8 @@ class Manifest {
 mismatch=true;
 }else{
  compare:
-for(varsriI=0;sriI<sri.length;sriI++){
-for(varoldI=0;oldI<old.length;oldI++){
+for(letsriI=0;sriI<sri.length;sriI++){
+for(letoldI=0;oldI<old.length;oldI++){
 if(sri[sriI].algorithm===old[oldI].algorithm&&
 BufferEquals(sri[sriI].value,old[oldI].value)&&
 sri[sriI].options===old[oldI].options){
@@ -205,7 +205,7 @@ class Manifest {
 constintegrityEntries=integrities.get(href);
 if(integrityEntries===true)returntrue;
 // Avoid clobbered Symbol.iterator
-for(vari=0;i<integrityEntries.length;i++){
+for(leti=0;i<integrityEntries.length;i++){
 const{
  algorithm,
 value: expected