chore(deps): update dependency gitversion.msbuild to 6.8.0 (#165)

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

Author: renovate[bot]

Directory.Packages.props

@@ -26,7 +26,7 @@
     <PackageVersion Include="Markdig" Version="1.3.2" />
     <PackageVersion Include="Microsoft.AspNetCore.Http" Version="2.3.11" />
     <!-- Versioning -->
-    <PackageVersion Include="GitVersion.MsBuild" Version="6.7.0" />
+    <PackageVersion Include="GitVersion.MsBuild" Version="6.8.0" />
     <PackageVersion Include="MinVer" Version="7.0.0" />
   </ItemGroup>
   <!-- .NET 8.0 packages -->