Update web-app.yml (#1021)

Author: gvreddy04

.github/workflows/web-app.yml

@@ -32,7 +32,7 @@ jobs:
         run: dotnet publish ./BlazorBootstrap.Demo.Server/BlazorBootstrap.Demo.Server.csproj -c Release -o ${{env.DOTNET_ROOT}}/myapp
 
       - name: Upload artifact for deployment job
-        uses: actions/upload-artifact@v3
+        uses: actions/upload-artifact@v4
         with:
           name: .net-app
           path: ${{env.DOTNET_ROOT}}/myapp