The solidity version pragma solidity ^0.8.20
will be acceptable for future updates. This leaves room for future feature and bugs to be introduced in the contract that might cause vulnerabilities. Please see https://consensys.github.io/smart-contract-best-practices/development-recommendations/solidity-specific/locking-pragmas/
A newer version of solidity might introduce a bug that makes this contract exploitable.
Lock the pragma version to the one you are testing on:
pragma solidity 0.8.20;
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