assert: use for...of

Refs: nodejs#30960

Author: soar-beep

lib/assert.js

@@ -869,9 +869,9 @@ assert.ifError = function ifError(err) {
       tmp2.shift();
       // Filter all frames existing in err.stack.
       let tmp1 = newErr.stack.split('\n');
-      for (let i = 0; i < tmp2.length; i++) {
+      for (const errFrame of tmp2) {
         // Find the first occurrence of the frame.
-        const pos = tmp1.indexOf(tmp2[i]);
+        const pos = tmp1.indexOf(errFrame);
         if (pos !== -1) {
           // Only keep new frames.
           tmp1 = tmp1.slice(0, pos);