Upgrade getrandom to 0.2.12 am: 1872b3e122 am: de0ba12639

Original change: https://android-review.googlesource.com/c/platform/external/rust/crates/getrandom/+/2944786

Change-Id: I25b2d1148527331f94c51708f2fa42513ec96338
Signed-off-by: Automerger Merge Worker <[email protected]>