Update win-cpu-arm64-build.yml: test the new pool (#1654)

Author: snnn

.github/workflows/win-cpu-arm64-build.yml

@@ -17,23 +17,24 @@ env:
 
 jobs:
   windows-cpu-arm64-build:
-    runs-on: ["self-hosted", "1ES.Pool=onnxruntime-genai-win11-arm64-cpu"]
+    runs-on: ["self-hosted", "1ES.Pool=onnxruntime-genai-win11-arm64-cpu2"]
     steps:
       - name: Checkout OnnxRuntime GenAI repo
         uses: actions/checkout@v4
         with:
           submodules: true
 
-      - name: Setup Visual Studio 2022
-        uses: microsoft/[email protected]
-        with:
-          vs-version: '17.4'
-          msbuild-architecture: arm64
-
       - uses: nuget/setup-nuget@v2
         with:
           nuget-version: '5.x'
 
+      - name: Set up Python 3.12 for ARM64
+        uses: actions/setup-python@v5
+        with:
+          python-version: '3.12'
+          architecture: 'arm64'
+          cache: 'pip'
+
       - name: Setup Java 21
         uses: actions/setup-java@v4
         with: