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This PR continues improving API required for Xcode 13 and Swift 5.5, where
CBService.peripheral
,CBCharacteristic.service
andCBDescriptor.characteristic
properties were changed from unowned to weak, effectively making them optional. The previous work has been done in #44, #50 and #51.As the goal of this library is to mimic the native API as much as possible, we decided to have the same behavior as in native API, that is for Swift 5.5 and newer, the properties will be weak, while for older versions continue to be unowned.