[CSL-779] Add "instance MonadDBLimits DBHolder" to Pos.Update.DB
[CSL-779] Add "instance MonadDBLimits DBHolder" to Pos.Update.DB

input-output-hk/pos-haskell-prototype,input-output-hk/cardano-sl,input-output-hk/pos-haskell-prototype,input-output-hk/pos-haskell-prototype,input-output-hk/cardano-sl,input-output-hk/cardano-sl,input-output-hk/cardano-sl