Remove obselete test mapping file am: 873ef6863b am: 5d5e15d2d2

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/ciborium-io/+/2411547

Change-Id: I87cf19d197c85acf8917184e55ee0cc3bef05a02
Signed-off-by: Automerger Merge Worker <[email protected]>