Remove unused imports

Author: reakaleek

src/Elastic.Markdown/Myst/Directives/TabSetBlock.cs

@@ -2,11 +2,8 @@
 // Elasticsearch B.V licenses this file to you under the Apache 2.0 License.
 // See the LICENSE file in the project root for more information
 
-using System.Linq;
-using System.Reflection.Metadata;
 using Elastic.Markdown.Diagnostics;
 using Elastic.Markdown.Helpers;
-using Markdig.Syntax;
 
 namespace Elastic.Markdown.Myst.Directives;