ci: Update microsoft/setup-msbuild to v2 from v1.3. (#7119)

This changes from using Node 16 to Node 20 internally, eliminating
some deprecation warnings from within GitHub Actions.

.github/workflows/Windows.yml

@@ -24,7 +24,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
       - name: Add msbuild to PATH
-        uses: microsoft/setup-msbuild@v1.3
+        uses: microsoft/setup-msbuild@v2
       - run: |
           md build
           cd build