⬆️ deps(dev): Bump hardhat from 2.8.2 to 2.8.4

Bumps hardhat from 2.8.2 to 2.8.4.

Release notes

Sourced from hardhat's releases.

Hardhat v2.8.4

This is a small patch version that improves the sample project and replaces a deprecated dependency.

Changelog

• The sample projects now include an empty .prettierc to make IDEs auto-formatting work properly in some scenarios.
• Replace deprecated eth-sig-util with @​metamask/eth-sig-util (Thanks @​frangio!)
• Upgraded the version of @nomiclabs/hardhat-etherscan used by the sample projects (#2217)

Hardhat v2.8.3

• Changes to support latest version of vyper plugin
• Use 40s as the default value for mocha's timeout and for the localhost network's timeout (#1549)

Commits

• 66ef793 Version Packages
• 7be815a Fix typo in task-definitions.ts (#2321)
• a850144 Merge pull request #2285 from nomiclabs/update-plugin-list
• be9bf3b Rm .prettierrc from advanced-ts sample project (#2286)
• 3f01790 Merge pull request #2272 from nomiclabs/fix-imports-hardhat-src
• ee1f2c8 Add @nomiclabs/*/src to forbidden imports
• d83a470 Merge pull request #2246 from sangxxh/issue/2217-sample-projects-update-hardh...
• 2425201 Create swift-eyes-fold.md
• 018688c Prevent importing hardhat/src with eslint
• d142f68 Merge pull request #2255 from albertov19/add-moonbeam
• Additional commits viewable in compare view