Revert version bump (handled separately by Dependabot PR #38)

https://claude.ai/code/session_018BsvAZMR1V4p6qRAvtk82P

Author: claude

PetrSvihlik.Com.csproj

@@ -24,7 +24,7 @@
     <PackageReference Include="System.DirectoryServices.Protocols" Version="10.0.5" />
     <PackageReference Include="System.Drawing.Common" Version="10.0.5" />
     <PackageReference Include="System.IdentityModel.Tokens.Jwt" Version="8.16.0" />
-    <PackageReference Include="System.Security.Cryptography.Xml" Version="10.0.6" />
+    <PackageReference Include="System.Security.Cryptography.Xml" Version="10.0.5" />
   </ItemGroup>
 
   <ItemGroup>