Use free memory pointer for returndatacopy

[frangio]

Fixing memory safety as explained here: https://github.com/OpenZeppelin/openzeppelin-contracts/pull/5052/files#r1616302783

The Solidity docs state:

these restrictions still need to be followed, even if the assembly block reverts or terminates.

[changeset-bot]

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Latest commit: 5a979b3

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[frangio]

Does this need a changeset?

[ernestognw]

Does this need a changeset?

I don't think so

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