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Latest version of ERC721.sol from OpenZeppelin does not have an
_exists()function anymore and thesafeTransferFromwith three vars is not virtual.In addition, keccak256().toEthSignedMessageHash() is longer packaged into EDCSA and requires importing an additional helper
MessageHashUtils.solThis PR updates the following files to be compatible with OZ v5.0+
It also updates the openzeppelin submodule to latest version.