Update dependency @openzeppelin/truffle-upgrades to v1.21.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@openzeppelin/truffle-upgrades (source)	1.11.0 -> 1.21.0

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Release Notes

OpenZeppelin/openzeppelin-upgrades (@​openzeppelin/truffle-upgrades)

v1.21.0

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• Include solc version in storage layouts in manifest files. (#​662)

v1.20.1

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• Override verify:verify subtask from hardhat-etherscan. (#​619)

Breaking change: To verify a proxy on Etherscan programmatically from a Hardhat script, call verify:verify instead of verify:

await hre.run("verify:verify", {
  address: PROXY_ADDRESS,
});

v1.20.0

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• Provide granular functions to allow more customizable deployments. (#​580)

v1.19.0

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• Return ethers transaction response with proposeUpgrade. (#​554)

v1.18.2

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• Update verify to be compatible with latest version of hardhat-etherscan. (#​592)

v1.18.1

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• Fix task redefinition error with hardhat-etherscan. (#​586)

v1.18.0

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• Support verifying a proxy on Etherscan using Hardhat. (#​579)

v1.17.1

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• Use proxy transaction hash for implementation contract abstraction. (#​737)

v1.17.0

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• Support specifying proxy kind for forceImport, fix importing UUPS proxy with admin (#​550)

v1.16.0

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• Use a lockfile when reading validations cache to avoid problems with parallel compilation in Hardhat 2.9.0. (#​530)
• Add an option unsafeSkipStorageCheck to skip storage layout compatibility check during upgrades. (#​495)

v1.15.1

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• Add dependencies on debug and ethers. (#​600)
• Improve check for admin contract in upgradeProxy. (#​604)

v1.15.0

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• Add forceImport function to import an existing proxy or beacon. (#​517)
• Extract and store more detailed information about storage layout. (#​519)

v1.14.0

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• Add an option unsafeSkipStorageCheck to skip storage layout compatibility check during upgrades. (#​495)

v1.13.0

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• Add forceImport function to import an existing proxy or beacon. (#​517)

v1.12.0

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• Add support for beacon proxies. (#​342)

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