Upgrade rayon to 1.7.0 am: a452597528 am: 72c30a8931 am: 4746a47f1b am: 4b65af3a6c

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/rayon/+/2520000

Change-Id: I5f69aac0e112a8df8aef73a6b4f343cec3de1d1d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>