Bump chart.js from 2.8.0 to 2.9.4 in /interactwel

Bumps [chart.js](https://github.com/chartjs/Chart.js) from 2.8.0 to 2.9.4.
- [Release notes](https://github.com/chartjs/Chart.js/releases)
- [Commits](chartjs/Chart.js@v2.8.0...v2.9.4)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

interactwel/package-lock.json

@@ -13,7 +13,7 @@
         "@fortawesome/vue-fontawesome": "^0.1.6",
         "axios": "^0.19.0",
         "bootstrap-vue": "^2.0.1",
-        "chart.js": "^2.8.0",
+        "chart.js": "^2.9.4",
         "chartjs-plugin-annotation": "^0.5.7",
         "d3": "^5.9.2",
         "d3-vs": "^0.8.0",