Bump chart.js from 3.3.2 to 3.4.0 in /frontend

Bumps [chart.js](https://github.com/chartjs/Chart.js) from 3.3.2 to 3.4.0.
- [Release notes](https://github.com/chartjs/Chart.js/releases)
- [Commits](https://github.com/chartjs/Chart.js/compare/v3.3.2...v3.4.0)

---
updated-dependencies:
- dependency-name: chart.js
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

frontend/package.json

@@ -31,7 +31,7 @@
         "axios-cache-adapter": "^2.7.3",
         "bootstrap": "^4.6.0",
         "bootstrap-vue": "^2.21.2",
-        "chart.js": "^3.3.2",
+        "chart.js": "^3.4.0",
         "icheck-bootstrap": "^3.0.1",
         "jquery-ui": "^1.12.1",
         "leaflet": "^1.7.1",

frontend/yarn.lock

@@ -1944,10 +1944,10 @@ chart.js@^2.9.4:
     chartjs-color "^2.1.0"
     moment "^2.10.2"
 
-chart.js@^3.3.2:
-  version "3.3.2"
-  resolved "https://registry.yarnpkg.com/chart.js/-/chart.js-3.3.2.tgz#667f3a0b6371b9719d8949c04a5bcbaec0d8c615"
-  integrity sha512-H0hSO7xqTIrwxoACqnSoNromEMfXvfuVnrbuSt2TuXfBDDofbnto4zuZlRtRvC73/b37q3wGAWZyUU41QPvNbA==
+chart.js@^3.4.0:
+  version "3.4.0"
+  resolved "https://registry.yarnpkg.com/chart.js/-/chart.js-3.4.0.tgz#4fb2a750225fcc1b387221422f5d4260b55b4579"
+  integrity sha512-mJsRm2apQm5mwz2OgYqGNG4erZh/qljcRZkWSa0kLkFr3UC3e1wKRMgnIh6WdhUrNu0w/JT9PkjLyylqEqHXEQ==
 
 chartjs-color-string@^0.6.0:
   version "0.6.0"