v0.12.0

0.12.0 (2023-08-02)

Bumps scale-encode and scale-decode to their latest versions (0.5 and 0.9 respectively).

One effect that this has is that structs containing compact encoded values, after being encoded, now decode to composite types that better
reflect their original shape. For example, Compact(MyWrapper { inner: 123 }), when encoded, used to decode to Value::u128(123),
but now it decodes to Value::named_composite(vec![("inner", Value::u128(123))]).