Bump @angular/core from 6.1.4 to 11.0.5 in /frontend

Bumps [@angular/core](https://github.com/angular/angular/tree/HEAD/packages/core) from 6.1.4 to 11.0.5.
- [Release notes](https://github.com/angular/angular/releases)
- [Changelog](https://github.com/angular/angular/blob/main/CHANGELOG.md)
- [Commits](https://github.com/angular/angular/commits/11.0.5/packages/core)

---
updated-dependencies:
- dependency-name: "@angular/core"
  dependency-type: direct:production
...

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

frontend/package-lock.json

@@ -321,11 +321,18 @@
       }
     },
     "@angular/core": {
-      "version": "6.1.4",
+      "version": "11.0.5",
-      "resolved": "https://registry.npmjs.org/@angular/core/-/core-6.1.4.tgz",
+      "resolved": "https://registry.npmjs.org/@angular/core/-/core-11.0.5.tgz",
-      "integrity": "sha512-8r2LpD4MR0hAYjWkElD/I6iXcugMK/HrpdtopDlRcxW2f6XuMN4mu8eS3g2fu72PwdGhtMcqDDFlbeJ8k599lw==",
+      "integrity": "sha512-XAXWQi7R3ucZXQwx9QK5jSKJeQyRJ53u2dQDpr7R5stzeCy1a5hrNOkZLg9zOTTPcth/6+FrOrRZP9SMdxtw3w==",
       "requires": {
-        "tslib": "1.9.3"
+        "tslib": "^2.0.0"
+      },
+      "dependencies": {
+        "tslib": {
+          "version": "2.4.0",
+          "resolved": "https://registry.npmjs.org/tslib/-/tslib-2.4.0.tgz",
+          "integrity": "sha512-d6xOpEDfsi2CZVlPQzGeux8XMwLT9hssAsaPYExaQMuYskwb+x1x7J371tWlbBdWHroy99KnVB6qIkUbs5X3UQ=="
+        }
       }
     },
     "@angular/forms": {

frontend/package.json

@@ -15,7 +15,7 @@
     "@angular/animations": "6.1.4",
     "@angular/common": "6.1.4",
     "@angular/compiler": "6.1.4",
-    "@angular/core": "6.1.4",
+    "@angular/core": "11.0.5",
     "@angular/forms": "6.1.4",
     "@angular/http": "6.1.4",
     "@angular/platform-browser": "6.1.4",