Bumps [chart.js](https://github.com/chartjs/Chart.js) from 2.9.3 to 2.9.4. - [Release notes](https://github.com/chartjs/Chart.js/releases) - [Commits](https://github.com/chartjs/Chart.js/compare/v2.9.3...v2.9.4) Signed-off-by: dependabot[bot] <support@github.com>