Bump Xcode version to 12.4.

This will allow us to target Big Sur for Mac ARM64 builds.

Bug: 1124119
Change-Id: I0aa17c744e13d45699e79eb17336ebcafb9ea719
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2777472
Reviewed-by: Mark Mentovai <mark@chromium.org>
Reviewed-by: Jeff Yoon <jeffyoon@google.com>
Commit-Queue: Brian Ryner <bryner@google.com>

recipes/recipe_modules/osx_sdk/api.py

@@ -29,7 +29,7 @@ _DEFAULT_VERSION_MAP = [
   ('10.13.6', '10b61'),
   ('10.14.3', '10g8'),
   ('10.14.4', '11b52'),
-  ('10.15.4', '12a7209')
+  ('10.15.4', '12d4e')
 ]
 
 

recipes/recipe_modules/osx_sdk/examples/full.expected/automatic_version.json

@@ -35,7 +35,7 @@
       "-kind",
       "mac",
       "-xcode-version",
-      "12a7209",
+      "12d4e",
       "-output-dir",
       "[CACHE]/osx_sdk/XCode.app"
     ],