Macworld After unveiling the new iPad Air and iPad Pro lines, cutting the 9th-gen iPad, and dropping the price of the 10th-gen iPad, inquiring minds want to know when Apple is going to give the iPad mini its overdue refresh. Unfortunately, it might be a while. According to Mark Bloomberg’s latest Power On newsletter, the iPad mini won’t be updated “until the end of this year at the earliest.” The iPad mini has had something of a sporadic update schedule since its 2012 debut. After an annual update schedule for the first 4 years, Apple has released just two updates in the past nine years, inclu…