fix: build failure due to missing 'using Nethermind.Core' (#12083)

* fix: build failure due to missing 'using Nethermind.Core'

* Update src/Nethermind/Nethermind.Merge.Plugin/EngineRpcModule.Bogota.cs

---------

Co-authored-by: Lukasz Rozmej <lukasz.rozmej@gmail.com>

Author: felix314159

src/Nethermind/Nethermind.Merge.Plugin/EngineRpcModule.Bogota.cs

@@ -3,7 +3,6 @@
 
 using System;
 using System.Threading.Tasks;
-using Nethermind.Consensus;
 using Nethermind.Consensus.Producers;
 using Nethermind.Core;
 using Nethermind.Core.Crypto;