infra: Upgrade XCode version to "12a7209".
This mirrors the version used in Chromium.
Bug: angleproject:5559
Change-Id: Ie1702281ce88fef00bf46079ae76477d33207dfd
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2679298Reviewed-by:
Yuly Novikov <ynovikov@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>
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