ORLANDO, Fla. — As milestones go, it was a pretty special one for Johnny Dawkins. With UCF’s 74-63 upset win over No. 23 Oklahoma at Addition Financial Arena on Saturday, the Knights’ coach secured his 300th career coaching win. He joins a group of 80 active Division I coaches with 300 or more wins during their careers. “Our guys really did lock in and execute the game plan and gave us a chance tonight,” said the 60-year-old Dawkins, who previously served as Stanford’s head coach. It was the second time this season that UCF (13-8, 4-5 Big 12) has defeated a ranked opponent, having knocked off …