LUCI: Switch to Xcode 12.4 12D4e

The LUCI bots run Mac-10.15.7 and the latest version supported
is 12.4

Bug: 218384527
Change-Id: I156171103fb9e256e711b67c53e8be50f8e66d9a
diff --git a/infra/luci/recipe_modules/macos_sdk/__init__.py b/infra/luci/recipe_modules/macos_sdk/__init__.py
index 6a20ec1..801083d 100644
--- a/infra/luci/recipe_modules/macos_sdk/__init__.py
+++ b/infra/luci/recipe_modules/macos_sdk/__init__.py
@@ -44,7 +44,7 @@
         ),
         default={
             'sdk_version':
- '13C5066c',
+ '12D4e',
             'tool_package':
  'infra/tools/mac_toolchain/${platform}',
             'tool_version':
diff --git a/infra/luci/recipe_modules/macos_sdk/examples/full.expected/mac.json b/infra/luci/recipe_modules/macos_sdk/examples/full.expected/mac.json
index 7d0f197..2f31aaa 100644
--- a/infra/luci/recipe_modules/macos_sdk/examples/full.expected/mac.json
+++ b/infra/luci/recipe_modules/macos_sdk/examples/full.expected/mac.json
@@ -35,7 +35,7 @@
       "-kind",
       "mac",
       "-xcode-version",
-      "13c5066c",
+      "12d4e",
       "-output-dir",
       "[CACHE]/macos_sdk/XCode.app"
     ],
diff --git a/infra/luci/recipes/perfetto.expected/ci_mac.json b/infra/luci/recipes/perfetto.expected/ci_mac.json
index 4c9f89f..33125de 100644
--- a/infra/luci/recipes/perfetto.expected/ci_mac.json
+++ b/infra/luci/recipes/perfetto.expected/ci_mac.json
@@ -125,7 +125,7 @@
       "-kind",
       "mac",
       "-xcode-version",
-      "13c5066c",
+      "12d4e",
       "-output-dir",
       "[CACHE]/macos_sdk/XCode.app"
     ],
@@ -677,7 +677,7 @@
       "-kind",
       "mac",
       "-xcode-version",
-      "13c5066c",
+      "12d4e",
       "-output-dir",
       "[CACHE]/macos_sdk/XCode.app"
     ],