Bump @angular/core in /web/src/main/resources/saga-frontend

Bumps [@angular/core](https://github.com/angular/angular/tree/HEAD/packages/core) from 6.0.0 to 11.0.5.
- [Release notes](https://github.com/angular/angular/releases)
- [Changelog](https://github.com/angular/angular/blob/11.0.5/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] <[email protected]>

web/src/main/resources/saga-frontend/package.json

@@ -27,7 +27,7 @@
     "@angular/animations": "6.0.0",
     "@angular/common": "6.0.0",
     "@angular/compiler": "6.0.0",
-    "@angular/core": "6.0.0",
+    "@angular/core": "11.0.5",
     "@angular/forms": "6.0.0",
     "@angular/http": "6.0.0",
     "@angular/platform-browser": "6.0.0",