Bump chart.js from 2.8.0 to 2.9.4

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](https://github.com/chartjs/Chart.js/compare/v2.8.0...v2.9.4)

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

package.json

@@ -14,7 +14,7 @@
     "bootstrap-social": "^5.1.1",
     "bootstrap-tagsinput": "^0.7.1",
     "bootstrap-timepicker": "^0.5.2",
-    "chart.js": "^2.7.3",
+    "chart.js": "^2.9.4",
     "chocolat": "^0.4.21",
     "cleave.js": "^1.4.7",
     "codemirror": "^5.43.0",

yarn.lock

@@ -963,10 +963,10 @@ chalk@^2.1.0, chalk@^2.3.0, chalk@^2.4.1, chalk@^2.4.2:
     escape-string-regexp "^1.0.5"
     supports-color "^5.3.0"
 
-chart.js@^2.7.3:
-  version "2.8.0"
-  resolved "https://registry.yarnpkg.com/chart.js/-/chart.js-2.8.0.tgz#b703b10d0f4ec5079eaefdcd6ca32dc8f826e0e9"
-  integrity sha512-Di3wUL4BFvqI5FB5K26aQ+hvWh8wnP9A3DWGvXHVkO13D3DSnaSsdZx29cXlEsYKVkn1E2az+ZYFS4t0zi8x0w==
+chart.js@^2.9.4:
+  version "2.9.4"
+  resolved "https://registry.yarnpkg.com/chart.js/-/chart.js-2.9.4.tgz#0827f9563faffb2dc5c06562f8eb10337d5b9684"
+  integrity sha512-B07aAzxcrikjAPyV+01j7BmOpxtQETxTSlQ26BEYJ+3iUkbNKaOJ/nDbT6JjyqYxseM0ON12COHYdU2cTIjC7A==
   dependencies:
     chartjs-color "^2.1.0"
     moment "^2.10.2"