Bump gatsby-cli from 2.19.2 to 3.0.0 in /client

Bumps [gatsby-cli](https://github.com/gatsbyjs/gatsby/tree/HEAD/packages/gatsby-cli) from 2.19.2 to 3.0.0.
- [Release notes](https://github.com/gatsbyjs/gatsby/releases)
- [Changelog](https://github.com/gatsbyjs/gatsby/blob/master/packages/gatsby-cli/CHANGELOG.md)
- [Commits](https://github.com/gatsbyjs/gatsby/commits/gatsby-cli@3.0.0/packages/gatsby-cli)

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