I had the same problem: "Xcode doesn’t support iOS 14.6 (18F72)."
My Xcode supported only up to 14.4.
My solution was:
Applications >> Xcode >> Right Click >> Show Package Contents >> Contents >> Developer >> Platforms >> iPhoneOS.platform >> DeviceSupport (https://medium.com/macoclock/how-to-add-device-support-files-to-xcode-ce4ca5965092).
Download 14.5 from https://github.com/iGhibli/iOS-DeviceSupport/tree/master/DeviceSupport
Create the folder 14.6 and add the files iOS 14.5 "DeveloperDiskImage.dmg" and "DeveloperDiskImage.dmg.signature" .
Restart Xcode.
Allan_Abu
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