Update aspnetcore-upload.csproj

Updated Asp.NetCore.SpaServices.Extensions to 6.0.9, confirmed operation.

Author: LanceMcCarthy

examples-standalone/aspnetcore-upload/aspnetcore-upload.csproj

@@ -14,7 +14,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Microsoft.AspNetCore.SpaServices.Extensions" Version="5.0.5" />
+    <PackageReference Include="Microsoft.AspNetCore.SpaServices.Extensions" Version="6.0.9" />
   </ItemGroup>
 
   <ItemGroup>