lib: update msgpuck library

The msgpack dependency has been updated because the new version
introduces the new method mp_stack_top for the mp_stack class
which we will use to store a pointer for a multikey frame to
initialize a field_map in case of multikey index.

As the library API has changed, the code has been modified
correspondingly.

@locker: add missing frame update in vy_stmt_new_surrogate_delete.

Needed for #1012