Support for Angular 21

[Czar-Ec]

Is your feature request related to a problem? Please describe.
Latest version is not compatible with Angular 21

Describe the solution you'd like
Changes to update the package to be compatible with Angular 21

[EisLuke]

When can we expect the first version? 😃 We need this update because the official support for Angular 19 is ending soon.

[ngdevc]

When will ngx-graph support Angular 21? This couldn't be used in my Angular v21 project due to version conflict.