chore(deps): update dependency markdig to 0.40.0

Author: renovate-bot

run/markdown-preview/Samples.Run.MarkdownPreview.Renderer/Samples.Run.MarkdownPreview.Renderer.csproj

@@ -8,7 +8,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="Markdig" Version="0.39.1" />
+    <PackageReference Include="Markdig" Version="0.40.0" />
   </ItemGroup>
 
 </Project>