Defining structs like 'Snapshots' is not yet supported when deploying ERC20SnapshotUpgradeable

Hi @ethicraul,

We have found an error in Upgrades Plugins for Truffle and Hardhat. Users of the flag unsafeAllowCustomTypes should update their dependencies to the latest version.

See post for more details: Problem in Upgrades Plugins for users of unsafeAllowCustomTypes.

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