Increase timeout for inAppPurchase test (#12403)

spec/api-in-app-purchase-spec.js

@@ -4,9 +4,11 @@ const assert = require('assert')
 
 const {remote} = require('electron')
 
-describe('inAppPurchase module', () => {
+describe('inAppPurchase module', function () {
   if (process.platform !== 'darwin') return
 
+  this.timeout(3 * 60 * 1000)
+
   const {inAppPurchase} = remote
 
   it('canMakePayments() does not throw', () => {