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Although the bot is named iOS13, since the rest of the waterfall is still
running Xcode 10.1, put the latest Xcode 10.2 here for completeness.

This will be rolled to the first iOS13 beta once it's available.

Change-Id: I4a6f3ebde9af1c5308b5cd428db6ff364610ed7e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1618804
Commit-Queue: Justin Cohen <justincohen@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664384}