update Flagd provider import path in .NET SDK tutorial

Signed-off-by: André Silva <[email protected]>

Author: askpt

docs/tutorials/getting-started/dotnet.mdx

@@ -174,7 +174,7 @@ Finally, let's add the required code change to enable the flagd provider in our
 using Microsoft.AspNetCore.Mvc;
 using OpenFeature;
 //diff-add-block-start
-using OpenFeature.Contrib.Providers.Flagd.DependencyInjection;
+using OpenFeature.DependencyInjection.Providers.Flagd;
 //diff-add-block-end
 //diff-remove-block-start
 using OpenFeature.Providers.Memory;