Update dependency Validation to 2.6.68 (#1168)

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

Author: renovate[bot]

Directory.Packages.props

@@ -37,7 +37,7 @@
     <PackageVersion Include="System.Security.Cryptography.Xml" Version="4.7.1" />
     <PackageVersion Include="System.Text.Json" Version="8.0.5" />
     <PackageVersion Include="System.Threading.Tasks.Dataflow" Version="9.0.2" />
-    <PackageVersion Include="Validation" Version="2.5.51" />
+    <PackageVersion Include="Validation" Version="2.6.68" />
     <PackageVersion Include="Xunit.Combinatorial" Version="1.6.24" />
     <PackageVersion Include="Xunit.SkippableFact" Version="1.5.23" />
   </ItemGroup>