Missing update from #746 (#751)

diff --git a/emsdk_manifest.json b/emsdk_manifest.json
index 9915b5b..1a2a687 100644
--- a/emsdk_manifest.json
+++ b/emsdk_manifest.json
@@ -407,7 +407,7 @@
   },
   {
     "id": "binaryen",
-    "version": "master",
+    "version": "main",
     "bitness": 32,
     "append_bitness": false,
     "url": "https://github.com/WebAssembly/binaryen.git",