Upgrade memoffset to 0.8.0 am: 0d0d25cb12 am: 6817016059 am: 88166c7f4d

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/memoffset/+/2419084

Change-Id: I36a5d01ac3c1569464e03ca24bcd9c0bf0af61a9
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>