To refresh a Pivot table, the shortcut is ALT+F5. If you want to refresh all Pivots in the workbook, the shortcut is CTRL+ALT+F5. This magical shortcut would do the trick and you don't need any macro to perform this task.

But on most of the computer this shortcut may not work. The reason is most of the CTRL+ALT+Fn shorcut keys are reserved by Intel HD Graphics card. You will need to de-reserve this key combination.

Control Panel > Intel HD Graphics (or anything related to Graphic Card, you can put Graphics in Search of Control Panel) > Options and Support > Disable the hot keys even though CTRL+ALT+F5 is not listed there.