Update dependency highcharts to v12 [SECURITY]

Author: renovate[bot]

rest/front-end/package.json

@@ -7,7 +7,7 @@
     "bootstrap": "^3.3.7",
     "bootstrap-sass": "^3.3.7",
     "font-awesome-sass": "^4.7.0",
-    "highcharts": "^6.0.2",
+    "highcharts": "^12.0.0",
     "lodash": "^4.17.4",
     "lz-string": "^1.4.4",
     "react": "^16.2.0",