fix: secure3-arbitrator-upgrade-issue-7

Author: zkbenny

contracts/Arbitrator.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: MIT OR Apache-2.0
 
-pragma solidity ^0.8.0;
+pragma solidity 0.8.25;
 
 import {OwnableUpgradeable} from "@openzeppelin/contracts-upgradeable/access/OwnableUpgradeable.sol";
 import {UUPSUpgradeable} from "@openzeppelin/contracts-upgradeable/proxy/utils/UUPSUpgradeable.sol";