chore(deps): bump chart.js from 3.0.2 to 3.1.0 in /frontend

Bumps [chart.js](https://github.com/chartjs/Chart.js) from 3.0.2 to 3.1.0.
- [Release notes](https://github.com/chartjs/Chart.js/releases)
- [Commits](chartjs/Chart.js@v3.0.2...v3.1.0)

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

frontend/package.json

@@ -27,7 +27,7 @@
     "@angular/platform-browser-dynamic": "~11.2.8",
     "@angular/router": "~11.2.9",
     "@ng-select/ng-select": "^6.1.0",
-    "chart.js": "^3.0.2",
+    "chart.js": "^3.1.0",
     "core-js": "^3.10.0",
     "jwt-decode": "^3.1.2",
     "ngx-markdown": "^11.1.1",