Run Mac_arm64 framework_tests_misc on Mac-14 with Xcode 16 (#162670)

This test was failing on macOS 14, but [may pass if used with Xcode
16](https://github.com/flutter/flutter/issues/150008#issuecomment-2368846893).
Let's force it to run with Xcode 16.

Fixes https://github.com/flutter/flutter/issues/150008.

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.ci.yaml

@@ -3938,7 +3938,7 @@ targets:
     recipe: flutter/flutter_drone
     timeout: 60
     properties:
-      os: Mac-13
+      os: Mac-14
       dependencies: >-
         [
           {"dependency": "goldctl", "version": "git_revision:2387d6fff449587eecbb7e45b2692ca0710b63b9"},
@@ -3946,6 +3946,11 @@ targets:
           {"dependency": "open_jdk", "version": "version:17"},
           {"dependency": "android_sdk", "version": "version:35v1"}
         ]
+      # TODO(vashworth): Remove once Xcode 16 is used by all tests
+      $flutter/osx_sdk : >-
+        {
+          "sdk_version": "16c5032a"
+        }
       shard: framework_tests
       subshard: misc
       tags: >