chore(deps): [security] bump yarn from 1.16.0 to 1.19.0 (#217)

Bumps [yarn](https://github.com/yarnpkg/yarn) from 1.16.0 to 1.19.0. **This update includes a security fix.**
- [Release notes](https://github.com/yarnpkg/yarn/releases)
- [Changelog](https://github.com/yarnpkg/yarn/blob/master/CHANGELOG.md)
- [Commits](yarnpkg/yarn@v1.16.0...v1.19.0)

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