[infra] Upgrade iPhone6 to iOS 12.4.5

Change-Id: Ifce942d04351964a67a50275fbaa3287bfa4dd63
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/274199
Auto-Submit: Ben Wagner aka dogben <benjaminwagner@google.com>
Reviewed-by: Weston Tracey <westont@google.com>
Commit-Queue: Ben Wagner aka dogben <benjaminwagner@google.com>
7 files changed