Update Xcode

Change-Id: I9cbde153c26a2b4c4ef4ffc9bc9174948b4ed400
Reviewed-on: https://skia-review.googlesource.com/c/skcms/+/272918
Commit-Queue: Mike Klein <mtklein@google.com>
Auto-Submit: Ben Wagner aka dogben <benjaminwagner@google.com>
Reviewed-by: Mike Klein <mtklein@google.com>
diff --git a/infra/bots/bot.py b/infra/bots/bot.py
index 0c27ec2..de26a51 100644
--- a/infra/bots/bot.py
+++ b/infra/bots/bot.py
@@ -22,7 +22,7 @@
   xcode_app_path = os.path.join(os.getcwd(), sys.argv[4])
   # See mapping of Xcode version to Xcode build version here:
   # https://chromium.googlesource.com/chromium/tools/build/+/master/scripts/slave/recipe_modules/ios/api.py#37
-  XCODE_BUILD_VERSION = '9c40b'
+  XCODE_BUILD_VERSION = '11c29'
   call(('{mac_toolchain}/mac_toolchain install '
         '-kind mac '
         '-xcode-version {xcode_build_version} '