Change torchao runner

Author: metascroy

.github/workflows/trunk.yml

@@ -315,7 +315,7 @@ jobs:
     name: test-llama-torchao-lowbit
     uses: pytorch/test-infra/.github/workflows/macos_job.yml@main
     with:
-      runner: macos-m1-stable
+      runner: macos-14
       python-version: '3.11'
       submodules: 'recursive'
       ref: ${{ github.event_name == 'pull_request' && github.event.pull_request.head.sha || github.sha }}