Bump Markdig.Signed from 0.38.0 to 0.40.0 in /src

Bumps [Markdig.Signed](https://github.com/xoofx/markdig) from 0.38.0 to 0.40.0.
- [Release notes](https://github.com/xoofx/markdig/releases)
- [Changelog](https://github.com/xoofx/markdig/blob/master/changelog.md)
- [Commits](xoofx/markdig@0.38.0...0.40.0)

---
updated-dependencies:
- dependency-name: Markdig.Signed
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

src/examples/blazor/Whetstone.ChatGPT.Blazor.App/Whetstone.ChatGPT.Blazor.App/Whetstone.ChatGPT.Blazor.App.csproj

@@ -22,7 +22,7 @@
 		<PackageReference Include="Blazorise.Components" Version="1.7.1" />
 		<PackageReference Include="Blazorise.DataGrid" Version="1.7.0" />
 		<PackageReference Include="Blazorise.LoadingIndicator" Version="1.6.2" />
-		<PackageReference Include="Markdig.Signed" Version="0.38.0" />
+		<PackageReference Include="Markdig.Signed" Version="0.40.0" />
 		<PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly" Version="8.0.11" />
 		<PackageReference Include="Microsoft.AspNetCore.Components.WebAssembly.DevServer" Version="9.0.0" PrivateAssets="all" />
 	</ItemGroup>