Update dependency chart.js to v2.9.4 - autoclosed

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
chart.js (source)	2.9.3 -> 2.9.4

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Release Notes

chartjs/Chart.js (chart.js)

### [`v2.9.4`](https://togithub.com/chartjs/Chart.js/releases/tag/v2.9.4) [Compare Source](https://togithub.com/chartjs/Chart.js/compare/v2.9.3...v2.9.4) This is the last release of v2 and focused on fixing bugs identified in the v2.9.3 release. ### Bugs Fixed - [#​7404](https://togithub.com/chartjs/Chart.js/issues/7404) - Preserve prototypes when cloning. Thanks [@​iddings](https://togithub.com/iddings) - [#​7587](https://togithub.com/chartjs/Chart.js/issues/7587) - Fix docs for external moment.js. Thanks [@​mojoaxel](https://togithub.com/mojoaxel) - [#​7853](https://togithub.com/chartjs/Chart.js/issues/7853) - Fix box recursion when dimensions are NaN. Thanks [@​alessandroasm](https://togithub.com/alessandroasm) - [#​7883](https://togithub.com/chartjs/Chart.js/issues/7883) - Fix call stack exception when computing label sizes. Thanks [@​silentmatt](https://togithub.com/silentmatt) - [#​7918](https://togithub.com/chartjs/Chart.js/issues/7918) - Prevent global prototype pollution via the merge helper - [#​7920](https://togithub.com/chartjs/Chart.js/issues/7920) - Use Object.create(null) as `merge` target, to prevent prototype pollution

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