Change runner to macos-14-xlarge in workflow

Author: ZainRizvi

.github/workflows/pull.yml

@@ -845,7 +845,7 @@ jobs:
   compile-gguf:
     strategy:
       matrix:
-        runner: [macos-14]
+        runner: [macos-14-xlarge]
     runs-on: ${{matrix.runner}}
     steps:
       - name: Checkout repo