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This version of Xcode updates the macOS SDK to 11.0 20A2408 (closer to
11.0 than 11.0.1).

Bug: 1108831
Change-Id: I9fe09af1d325e0e68e7351fe7f92ce84e676c922
CQ-Include-Trybots: luci.chromium.try:mac-arm64-rel
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2537573
Commit-Queue: Mark Mentovai <mark@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827292}