[CI] Skip building binaryen from source on macOS

Our macOS CI instance is too old to build binaryen from source.

See https://github.com/WebAssembly/binaryen/pull/8609

test/test.py

diff --git a/test/test.py b/test/test.py
index 330fde1..b3e761e 100755
--- a/test/test.py
+++ b/test/test.py
@@ -277,6 +277,10 @@
     if WINDOWS:
       # It takes over 30 mins to build binaryen using Visual Studio in CI
       self.skipTest('test is too slow under windows')
+    if MACOS:
+      # Our CI uses and older version of macOS which only as 14.3.1
+      # TODO: Remove this if/when we update the emsdk CI.
+      self.skipTest('building binaryen requries xcode 15.3 because it uses std::ranges')
     run_emsdk(['install', '--build=Release', 'binaryen-main-64bit'])
 
   def test_no_32bit(self):