Upgrade rust/crates/cexpr to 0.6.0 am: 417a5cbdb1

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/cexpr/+/2137713

Change-Id: Ice506263b90568479ceed6ce1e5daa60eec5c3c7
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>