Merge "Upgrade rust/crates/ring to 0.16.20" am: b8b8a93bc2 am: 069ac96cc0

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/ring/+/1746781

Change-Id: I1349d5051e7df620eb61edd610fd4413b6208a06