Minimize Solidity pragma versions for interface compatibility (#5727)

contracts/interfaces/IERC721Enumerable.sol

@@ -1,6 +1,6 @@
 // SPDX-License-Identifier: MIT
 // OpenZeppelin Contracts (last updated v5.0.0) (interfaces/IERC721Enumerable.sol)
 
-pragma solidity ^0.8.20;
+pragma solidity >=0.6.2;
 
 import {IERC721Enumerable} from "../token/ERC721/extensions/IERC721Enumerable.sol";