Bump @coreui/angular-chartjs in /frontend/src/main/webapp

Bumps [@coreui/angular-chartjs](https://github.com/coreui/coreui-angular) from 5.2.19 to 5.2.20.
- [Release notes](https://github.com/coreui/coreui-angular/releases)
- [Changelog](https://github.com/coreui/coreui-angular/blob/main/CHANGELOG.md)
- [Commits](coreui/coreui-angular@5.2.19...5.2.20)

---
updated-dependencies:
- dependency-name: "@coreui/angular-chartjs"
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

frontend/src/main/webapp/package.json

@@ -35,7 +35,7 @@
     "@angular/platform-browser-dynamic": "18.2.6",
     "@angular/router": "18.2.6",
     "@coreui/angular": "5.2.19",
-    "@coreui/angular-chartjs": "5.2.19",
+    "@coreui/angular-chartjs": "5.2.20",
     "@coreui/chartjs": "4.0.0",
     "@coreui/coreui": "5.1.2",
     "@coreui/icons": "3.0.1",