Bump Markdig from 0.37.0 to 0.38.0 in the dotnet group (#50)

Bumps the dotnet group with 1 update: [Markdig](https://github.com/xoofx/markdig).


Updates `Markdig` from 0.37.0 to 0.38.0
- [Release notes](https://github.com/xoofx/markdig/releases)
- [Changelog](https://github.com/xoofx/markdig/blob/master/changelog.md)
- [Commits](xoofx/markdig@0.37.0...0.38.0)

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

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

Directory.Packages.props

@@ -26,7 +26,7 @@
     <PackageVersion Include="Nito.AsyncEx.Coordination" Version="5.1.2" />
     <PackageVersion Include="Pathological.Globbing" Version="8.0.4" />
     <PackageVersion Include="Swashbuckle.AspNetCore" Version="6.9.0" />
-    <PackageVersion Include="Markdig" Version="0.37.0" />
+    <PackageVersion Include="Markdig" Version="0.38.0" />
     <PackageVersion Include="Microsoft.AspNetCore.Components.WebAssembly.Server" Version="8.0.10" />
     <PackageVersion Include="Microsoft.AspNetCore.SignalR.Client" Version="8.0.10" />
     <PackageVersion Include="System.Linq.Async" Version="6.0.1" />