[sign-mac] Add dartvm to binaries

Fixes: https://github.com/dart-lang/sdk/issues/61235
Change-Id: I9c8a6db21ac86e37e17d39793debef0edd249ea8
Reviewed-on: https://dart-review.googlesource.com/c/recipes/+/443480
Auto-Submit: Alexander Thomas <athom@google.com>
Commit-Queue: Sigurd Meldgaard <sigurdm@google.com>
Reviewed-by: Sigurd Meldgaard <sigurdm@google.com>