Bump @nomicfoundation/hardhat-toolbox from 4.0.0 to 7.0.0

Bumps [@nomicfoundation/hardhat-toolbox](https://github.com/NomicFoundation/hardhat/tree/HEAD/packages/hardhat-toolbox) from 4.0.0 to 7.0.0.
- [Release notes](https://github.com/NomicFoundation/hardhat/releases)
- [Changelog](https://github.com/NomicFoundation/hardhat/blob/@nomicfoundation/hardhat-toolbox@7.0.0/packages/hardhat-toolbox/CHANGELOG.md)
- [Commits](https://github.com/NomicFoundation/hardhat/commits/@nomicfoundation/hardhat-toolbox@7.0.0/packages/hardhat-toolbox)

---
updated-dependencies:
- dependency-name: "@nomicfoundation/hardhat-toolbox"
  dependency-version: 7.0.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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Author: dependabot[bot]