Remove obselete test mapping file am: 873ef6863b

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

Change-Id: I55a98ab51a2ba522dabf50f43f7685c2e66fb4b7
Signed-off-by: Automerger Merge Worker <[email protected]>