Drake and 21 Savage’s “Spin Bout U” has climbed to No. 1 on Billboard’s Rap Airplay chart dated May 6, extending Drake’s record for the most leaders in the list’s history. According to Luminate, “Spin Bout U” logged 20.5 million airplay audience impressions during the week April 21-17. Drake now has 41 Rap Airplay No.…