Explicity initialise to empty bytes to fix static analysis check

Author: drinkcoffee

contracts/trading/seaport/zones/immutable-signed-zone/v2/ImmutableSignedZoneV2.sol

@@ -568,11 +568,7 @@ contract ImmutableSignedZoneV2 is
         uint256 scalingFactorDenominator
     ) internal pure returns (bytes32) {
         uint256 numberOfItems = receivedItems.length;
-        // Slither has added an additional checker. Rather than update this in-production code,
-        // disable the check for this line. The receivedItemsHash variable will be assigned a 
-        // default value, so the code works.
-        // @slither-disable-next-line uninitialized-local
-        bytes memory receivedItemsHash;
+        bytes memory receivedItemsHash = new bytes(0); // Explicitly initialize to empty bytes
 
         for (uint256 i; i < numberOfItems; i++) {
             receivedItemsHash = abi.encodePacked(