tls: refactor to avoid unsafe array iteration

Author: aduh95

lib/_tls_common.js

@@ -217,7 +217,8 @@ exports.createSecureContext = function createSecureContext(options) {
   // which leads to the crash later on.
   if (key) {
     if (ArrayIsArray(key)) {
-      for (const val of key) {
+      for (let i = 0; i < key.length; ++i) {
+        const val = key[i];
         // eslint-disable-next-line eqeqeq
         const pem = (val != undefined && val.pem !== undefined ? val.pem : val);
         setKey(c.context, pem, val.passphrase || passphrase);