Fix multiple import error

[mox692]

I got the following compile error in samply-symbols.

error[E0252]: the name `AsBytes` is defined multiple times
  --> /home/motoyuki/.cargo/registry/src/index.crates.io-6f17d22bba15001f/samply-symbols-0.23.0/src/breakpad/index.rs:15:23
   |
14 | use zerocopy::{AsBytes, LittleEndian, Ref, U32, U64};
   |                ------- previous import of the macro `AsBytes` here
15 | use zerocopy_derive::{AsBytes, FromBytes, FromZeroes, Unaligned};
   |                       ^^^^^^^--
   |                       |
   |                       `AsBytes` reimported here
   |                       help: remove unnecessary import
   |
   = note: `AsBytes` must be defined only once in the macro namespace of this module

[mstange]

Thank you!