Update @apple_support to version 1.12.0.

Fixes #474.

Change-Id: I9b93d7d8942d9da502ed79782c6a14ccaded5970
Reviewed-on: https://code-review.googlesource.com/c/re2/+/62690
Reviewed-by: Alex Chernyakhovsky <achernya@google.com>
Reviewed-by: Paul Wankadia <junyer@google.com>