Cellular iPads, Apple Vision Pro, iPad mini (A20 Pro)

Data fixes:

• Eight recent iPads now report hasCellular for their cellular identifier: iPad Air 11-inch and 13-inch (M3) and (M4), iPad (A16), iPad mini (A17 Pro) and iPad Pro 11-inch and 13-inch (M5). Both identifiers of each had been Wi-Fi.

New devices:

• Apple Vision Pro (RealityDevice14,1, M2) and Apple Vision Pro (M5) (RealityDevice17,1), with family == .vision.
• iPad mini (A20 Pro) (iPad19,1, iPad19,2), 8.5-inch.

Data pipeline:

• Scripts/update-devices.py reads Xcode's visionOS device list too, and marks a new device cellular when the device Xcode falls back to is, since each device falls back to its predecessor of the same kind.
• A test fails if an iPad model has several identifiers and none of them is cellular.