fix: Silence slither warnings

- low level calls are fine, since we are checking for success, and we have already checked for contract existence when setting swap executors
- dead-code is silenced
- fix solidity version

foundry/interfaces/ISwapExecutor.sol

@@ -1,5 +1,5 @@
 // SPDX-License-Identifier: UNLICENSED
-pragma solidity >=0.7.5;
+pragma solidity ^0.8.28;
 
 import "@openzeppelin/contracts/token/ERC20/IERC20.sol";