[infra] Add ios-dev-image-11.4 asset

Needed for https://skia-review.googlesource.com/c/skia/+/270446

Bug: skia:9799
Change-Id: I0b5814aa3bae73ca6c231b5ced7a0c94e0efa6dc
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/270447
Commit-Queue: Ben Wagner aka dogben <benjaminwagner@google.com>
Reviewed-by: Weston Tracey <westont@google.com>
5 files changed