Upgrade libloading to 0.8.1 am: 852cba42bb

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/libloading/+/2946225

Change-Id: Ie412af8892f231f182a4f7efe07c3cbd7bad7bcf
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>