Support Angular v21

Since Angular v21 was released, it would be nice to support the new version.

In the meantime to update the peer dependencies can be overridden:
 
```json
"@swimlane/ngx-datatable": {
  "@angular/common": "$@angular/common",
  "@angular/core": "$@angular/core",
  "@angular/platform-browser": "$@angular/platform-browser"
 },
```