Update lock_api to 0.4.6 am: 93e109d886 am: 0817750d9c am: 36129edb01 am: 4783e793f2

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/lock_api/+/2005911

Change-Id: I527c4201cbc6bcbea3b6624e2a583a94ddcee721