Bump Markdig from 1.1.3 to 1.2.0 (#406)

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: MihailsKuzmins <47413092+MihailsKuzmins@users.noreply.github.com>

Author: dependabot[bot]

src/MudBlazor.Markdown/MudBlazor.Markdown.csproj

@@ -21,7 +21,7 @@
 	</PropertyGroup>
 
 	<ItemGroup>
-		<PackageReference Include="Markdig" Version="1.1.3" />
+		<PackageReference Include="Markdig" Version="1.2.0" />
 		<PackageReference Include="MudBlazor" Version="9.5.0" />
 	</ItemGroup>