This adjusts iOS version to the actual one on the tester bot.
Bug: webrtc:10047
Change-Id: I7d104f331450192142c8c2c1259a3207dcee45ed
Reviewed-on: https://webrtc-review.googlesource.com/c/113420
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Artem Titarenko <artit@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25917}