chore(deps): update dependency markdig to v1 (#79)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Directory.Packages.props

@@ -27,7 +27,7 @@
 
     <!-- Code quality -->
     <PackageVersion Include="FluentValidation" Version="12.1.1" />
-    <PackageVersion Include="Markdig" Version="0.45.0" />
+    <PackageVersion Include="Markdig" Version="1.0.0" />
     <PackageVersion Include="Microsoft.AspNetCore.Http" Version="2.3.9" />
 
     <!-- Versioning -->