This version of the Toolbox upgrades solidity-coverage to its latest version. Since this new version includes some breaking changes, we are bumping the Toolbox to a new major version.
If you want to upgrade to this version and you are using npm 7 or later, you only need to upgrade the Toolbox:
npm i --save-dev hardhat@latest @nomicfoundation/hardhat-toolbox@latest
If you are using yarn or an old version of npm, you'll also need to upgrade Hardhat and solidity-coverage:
yarn add --dev hardhat@latest @nomicfoundation/hardhat-toolbox@latest solidity-coverage@latest