Bump libsignal client to 0.62

[rubdos]

This rewires some APIs to accept DeviceId instead of u32.

It also removes the ServiceIdExt trait, since
signalapp/libsignal#595 got merged. The aci() and pni() methods can be replaced with simple into() or from() calls, depending on context.

[rubdos]

I made an attempt to make our DEFAULT_DEVICE_ID to be of libsignal_protocol::DeviceId type, instead of u32, but that isn't possible because the wrapped value is private, and From::from is not const. I could propose a Default implementation, or a custom default function upstream, to get rid of the weak type...