dig: use built-in resolver timeout

src/dns/waitfordns.js

@@ -6,6 +6,7 @@ const assert = require('assert'),
     BoxError = require('../boxerror.js'),
     debug = require('debug')('box:dns/waitfordns'),
     dig = require('../dig.js'),
+    dns = require('node:dns'),
     promiseRetry = require('../promise-retry.js'),
     safe = require('safetydance'),
     _ = require('underscore');
@@ -50,7 +51,7 @@ async function isChangeSynced(hostname, type, value, nameserver) {
         const resolver = type === 'A' || type === 'AAAA' ? resolveIp(hostname, type, resolveOptions) : dig.resolve(hostname, 'TXT', resolveOptions);
 
         const [error, answer] = await safe(resolver);
-        if (error && error.code === 'TIMEOUT') {
+        if (error && error.code === dns.TIMEOUT) {
             debug(`isChangeSynced: NS ${nameserver} (${nsIp}) timed out when resolving ${hostname} (${type})`);
             status[i] = true; // should be ok if dns server is down
             continue;