Merge "Upgrade either to 1.8.0" am: d56fe52eac

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

Change-Id: Ica653dc9ef6884476c41a3cd80082595882c1598
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>