[fuchsia] Fix Mac SDK roll failure (#18509)

fixes deps for zircon/sdk_ext as well
diff --git a/DEPS b/DEPS
index a5d0dc0..aa1311f 100644
--- a/DEPS
+++ b/DEPS
@@ -549,7 +549,7 @@
      'packages': [
        {
         'package': 'fuchsia/sdk/core/mac-amd64',
-        'version': '-VXmmm-0WUDATxoDGzhfXVbgdOSasnwwj5gk3nmwwmEC'
+        'version': 'BdllvvqAyu9udKsK1RjhnMZWJEAPMtr_ovlo3KXAu10C'
        }
      ],
      'condition': 'host_os == "mac"',
diff --git a/shell/platform/fuchsia/dart-pkg/zircon/BUILD.gn b/shell/platform/fuchsia/dart-pkg/zircon/BUILD.gn
index 9163555..a89ef07 100644
--- a/shell/platform/fuchsia/dart-pkg/zircon/BUILD.gn
+++ b/shell/platform/fuchsia/dart-pkg/zircon/BUILD.gn
@@ -24,6 +24,7 @@
 
   deps = [
     "$fuchsia_sdk_root/pkg:async-cpp",
+    "$fuchsia_sdk_root/pkg:async-default",
     "$fuchsia_sdk_root/pkg:async-loop-cpp",
     "$fuchsia_sdk_root/pkg:fdio",
     "$fuchsia_sdk_root/pkg:zx",
diff --git a/shell/platform/fuchsia/dart-pkg/zircon/sdk_ext/handle_waiter.cc b/shell/platform/fuchsia/dart-pkg/zircon/sdk_ext/handle_waiter.cc
index 090c90b..96d4d31 100644
--- a/shell/platform/fuchsia/dart-pkg/zircon/sdk_ext/handle_waiter.cc
+++ b/shell/platform/fuchsia/dart-pkg/zircon/sdk_ext/handle_waiter.cc
@@ -4,7 +4,7 @@
 
 #include "handle_waiter.h"
 
-#include <lib/async-loop/default.h>
+#include <lib/async/default.h>
 
 #include "handle.h"
 #include "third_party/tonic/converter/dart_converter.h"