Attempt M1 runners.

Author: tzarc

.github/workflows/create_toolchains.yaml

@@ -20,7 +20,7 @@ jobs:
           - runner: macosX64
             host_labels: '["macos-12"]'
           - runner: macosARM64
-            host_labels: '["self-hosted", "macOS", "ARM64"]'
+            host_labels: '["macos-13-xlarge"]' #'["self-hosted", "macOS", "ARM64"]'
 
     steps:
       - name: "Clone crosstool-ng repo"