Bump chart.js from 2.8.0 to 2.9.1 (#6567)

Bumps [chart.js](https://github.com/chartjs/Chart.js) from 2.8.0 to 2.9.1.
- [Release notes](https://github.com/chartjs/Chart.js/releases)
- [Commits](chartjs/Chart.js@v2.8.0...v2.9.1)

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

package.json

@@ -24,7 +24,7 @@
     "bootstrap-3-typeahead": "^4.0.2",
     "bootstrap-datepicker": "^1.6.0",
     "bootstrap-tokenfield": "^0.12.0",
-    "chart.js": "^2.8.0",
+    "chart.js": "^2.9.1",
     "cytoscape": "^3.11.0",
     "debounce": "jywarren/debounce#patch-1",
     "file-saver": "^2.0.0",

yarn.lock

@@ -782,9 +782,10 @@ charm@~0.1.0:
   version "0.1.2"
   resolved "https://registry.yarnpkg.com/charm/-/charm-0.1.2.tgz#06c21eed1a1b06aeb67553cdc53e23274bac2296"
 
-chart.js@^2.8.0:
-  version "2.8.0"
-  resolved "https://registry.yarnpkg.com/chart.js/-/chart.js-2.8.0.tgz#b703b10d0f4ec5079eaefdcd6ca32dc8f826e0e9"
+chart.js@^2.9.1:
+  version "2.9.1"
+  resolved "https://registry.yarnpkg.com/chart.js/-/chart.js-2.9.1.tgz#e98893a810d40d1c0a016e6872a13fa5faedcdf8"
+  integrity sha512-DA5dFt0Bz79oz56ezmrwmZqj0hXGs+i9VbCFOcHqbwrHIGv7RI4YqninJKNIAC0qa29WBI9qYTN7LzULlOeunA==
   dependencies:
     chartjs-color "^2.1.0"
     moment "^2.10.2"