Update hashbrown to 0.12.0 am: c77953dabf am: 8a0d8f98c0 am: c1d6158cc9 am: 6c8e4120ef

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/hashbrown/+/2005992

Change-Id: I6eec2c1046269bcbcbcaceabe39180685ff199c4