chore: pin contract versions

Author: MegaRedHand

claim_contracts/foundry.toml

@@ -5,6 +5,8 @@ libs = ["lib"]
 optimizer = true
 optimizer_runs = 999_999
 
+solc_version = "0.8.28"
+
 # See more config options https://github.com/foundry-rs/foundry/blob/master/crates/config/README.md#all-options
 fs_permissions = [
     { access = "read-write", path = "script-out/" },

claim_contracts/src/AlignedToken.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.19;
+pragma solidity 0.8.28;
 
 import "@openzeppelin/contracts-upgradeable/proxy/utils/Initializable.sol";
 import "@openzeppelin/contracts-upgradeable/token/ERC20/ERC20Upgradeable.sol";

claim_contracts/src/ClaimableAirdrop.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: MIT
-pragma solidity ^0.8.13;
+pragma solidity 0.8.28;
 
 import "@openzeppelin/contracts/token/ERC20/IERC20.sol";
 import "@openzeppelin/contracts/utils/cryptography/MerkleProof.sol";