Upgrade SDK dependency to 2.12.0-0 (#107)
Upgrade SDK dependency to 2.12.0-0 (#107)

* Upgrade SDK dependency to 2.12.0-0


Co-authored-by: Nate Bosch <dc212c74d8afde9c690fdd09e74d3e5c5d5a3de0@google.com>
dart-lang/crypto