ci: use newer download artifacts version

Author: Foxtrot47

.github/workflows/dotnet-winui3.yml

@@ -50,7 +50,7 @@ jobs:
 
     # Upload the MSIX package: https://github.com/marketplace/actions/upload-a-build-artifact
     - name: Upload MSIX package
-      uses: actions/upload-artifact@v2
+      uses: actions/download-artifact@v4
       with:
         name: Package
         path: Crimson\bin\x64\Release\net8.0-windows10.0.19041.0\win-x64\publish\