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

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

Change-Id: I3332ba3eb901123f5e115dd09a62e4913324e7ae
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>