Take a look at https://github.com/code-423n4/2024-03-zksync/blob/4f0ba34f34a864c354c7e8c47643ed8f4a250e13/code/contracts/ethereum/contracts/state-transition/libraries/PriorityQueue.sol#L45
But from here  we can see that both _queue.tail & _queue.head are of unit256 already so theres no need for this casting.
Remove the unnecessary casting.
