build(deps): bump npm from 6.14.1 to 6.14.6 (dinerojs#164)

Bumps [npm](https://github.com/npm/cli) from 6.14.1 to 6.14.6.
- [Release notes](https://github.com/npm/cli/releases)
- [Changelog](https://github.com/npm/cli/blob/latest/CHANGELOG.md)
- [Commits](npm/cli@v6.14.1...v6.14.6)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>