Update Mono.Cecil package to 0.11.6

it fixes certain issues of pdb files being unsynced with code

Author: alex-kulakov

Weaver/Xtensive.Orm.Weaver/Xtensive.Orm.Weaver.csproj

@@ -11,7 +11,7 @@
     <Configurations>Debug;Release;Debug-NET6;Release-NET6;Debug-NET7;Release-NET7;Debug-NET8;Release-NET8</Configurations>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Mono.Cecil" Version="0.11.2" />
+    <PackageReference Include="Mono.Cecil" Version="0.11.6" />
   </ItemGroup>
   <ItemGroup>
     <Folder Include="Properties\" />