Merge "Upgrade either to 1.8.0" am: d56fe52eac am: 51a093df75 am: a312c84be6

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/either/+/2337602

Change-Id: I2608e06ad0f498967209d61b6f2f9c8867ebc175
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>