Update memoffset to 0.6.5 am: 7d73837aa7 am: 451924e326 am: e84c21bfa9

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/memoffset/+/2005932

Change-Id: I848c18407bca3424b315c83215467d6dbdf89f42