chore: update to angular 21

[leonardomnds]

Hello @orizens, happy to contribute to this library.

This PR includes:

• Upgrade Angular dependencies to v21
• Update CHANGELOG.md

[badinmichal]

@orizens Hi, is it possible for you to review this PR and possibly make a release afterwards please ?

[softworckx]

I'm also very interested in the Angular 21 version of this library :blush:

[marklagendijk]

As a temporary workaround, you can explicitly override the problematic peer dependency, by adding the following to our package.json:

  "overrides": {
    "@angular/common": "$@angular/common",
    "@angular/core": "$@angular/core"
  }

[orizens]

@leonardomnds thank you for your pr - v21 is released