Upgrade userfaultfd-sys to 0.4.3 am: 29d0edf47f

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/userfaultfd-sys/+/2515095

Change-Id: I8efff395dff990ad1c2193d7f6d9427b5caa1c74
Signed-off-by: Automerger Merge Worker <[email protected]>