fix(ci): 移除不必要的 setup-dotnet 步骤，windows-latest 自带 .NET Framework 4.7.2 环境

.github/workflows/ci-windows.yml

@@ -13,11 +13,6 @@ jobs:
       - name: Checkout
         uses: actions/checkout@v4
 
-      - name: Setup .NET SDK (for dotnet CLI)
-        uses: actions/setup-dotnet@v4
-        with:
-          dotnet-version: '8.0.x'
-
       - name: Restore NuGet packages
         run: dotnet restore