Apple’s long-rumoured Siri smart speaker is already in production, according to a new report by Mark Gurman at Bloomberg. Citing people familiar with the matter, Gurman lends his weight to recent rumours that Apple may in fact debut the speaker next week at WWDC, although he stops short of declaring that a sure thing, and notes that sources suggest the device will still not be ready to ship until later in the year. Gurman’s report also…