[Draft] switch angle to metal-freeze branch m1

* intel branch stopped building long ago

Author: ChristopherHX

.github/workflows/m1.yml

@@ -133,7 +133,7 @@ jobs:
         mkdir $INSDIR
         git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git
         $Env:PATH = $Env:PATH + ':' + $PWD.ToString() + '/depot_tools'
-        git clone https://github.com/minecraft-linux/angle.git -b angle-renderdragon
+        git clone https://github.com/minecraft-linux/angle.git -b metal-freeze
         pushd angle
         python scripts/bootstrap.py
         gclient sync