Bump chart.js from 3.1.1 to 3.2.0 in /frontend

Bumps [chart.js](https://github.com/chartjs/Chart.js) from 3.1.1 to 3.2.0.
- [Release notes](https://github.com/chartjs/Chart.js/releases)
- [Commits](https://github.com/chartjs/Chart.js/compare/v3.1.1...v3.2.0)

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

frontend/package.json

@@ -30,7 +30,7 @@
         "admin-lte": "^3.1.0",
         "bootstrap": "^4.6.0",
         "bootstrap-vue": "^2.21.2",
-        "chart.js": "^3.0.2",
+        "chart.js": "^3.2.0",
         "icheck-bootstrap": "^3.0.1",
         "jquery-ui": "^1.12.1",
         "leaflet": "^1.7.1",

frontend/yarn.lock

@@ -2070,10 +2070,10 @@ chart.js@^2.9.4:
     chartjs-color "^2.1.0"
     moment "^2.10.2"
 
-chart.js@^3.0.2:
-  version "3.1.1"
-  resolved "https://registry.yarnpkg.com/chart.js/-/chart.js-3.1.1.tgz#2cdbda7fccea532313332fe822f0cae268f24cf3"
-  integrity sha512-ghNJersc9VD9MECwa5bL8gqvCkndW6RSCicdEHL9lIriNtXwKawlSmwo+u6KNXLYT2+f24GdFPBoynKW3ke4MQ==
+chart.js@^3.2.0:
+  version "3.2.0"
+  resolved "https://registry.yarnpkg.com/chart.js/-/chart.js-3.2.0.tgz#3d0a4b62b6bee428f8547db6aa68c792b130c260"
+  integrity sha512-Ml3R47TvOPW6gQ6T8mg/uPvyOASPpPVVF6xb7ZyHkek1c6kJIT5ScT559afXoDf6uwtpDR2BpCommkA5KT8ODg==
 
 chartjs-color-string@^0.6.0:
   version "0.6.0"