Update dependency solidity-coverage to v0.7.20

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
solidity-coverage	0.7.19 -> 0.7.20

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Release Notes

sc-forks/solidity-coverage

### [`v0.7.20`](https://togithub.com/sc-forks/solidity-coverage/blob/HEAD/CHANGELOG.md#​0720--2022-02-15) [Compare Source](https://togithub.com/sc-forks/solidity-coverage/compare/6136b1025fee2285c082bda6cb42ed4630a510b2...6b0dab0ff57720943acc76bc0c6528d888c28d3b) \=================== - Remove early V7 Truffle patches ([https://github.com/sc-forks/solidity-coverage/issues/693](https://togithub.com/sc-forks/solidity-coverage/issues/693))

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