build: Bump eslint from 5.15.1 to 7.4.0

Bumps [eslint](https://github.com/eslint/eslint) from 5.15.1 to 7.4.0.
- [Release notes](https://github.com/eslint/eslint/releases)
- [Changelog](https://github.com/eslint/eslint/blob/master/CHANGELOG.md)
- [Commits](eslint/eslint@v5.15.1...v7.4.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]