Bump solidity-coverage from 0.7.4 to 0.7.14 (ChainSafe#222)

Bumps [solidity-coverage](https://github.com/sc-forks/solidity-coverage) from 0.7.4 to 0.7.14.
- [Release notes](https://github.com/sc-forks/solidity-coverage/releases)
- [Changelog](https://github.com/sc-forks/solidity-coverage/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sc-forks/solidity-coverage/commits)

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Author: dependabot-preview[bot]