Bump Binaryen to 120 (#23197)

WebAssembly/binaryen#7153 updated Binaryen
version to 121, but bumping the version to 121 here does not pass the CI
(because Binaryen version is behind by 2), so this updates the version
to 120 for the moment.

Author: aheejin

tools/building.py

@@ -39,7 +39,7 @@
 
 #  Building
 binaryen_checked = False
-EXPECTED_BINARYEN_VERSION = 119
+EXPECTED_BINARYEN_VERSION = 120
 
 _is_ar_cache: Dict[str, bool] = {}
 # the exports the user requested