build(deps-dev): bump ng-packagr from 20.3.2 to 21.0.0

Bumps [ng-packagr](https://github.com/ng-packagr/ng-packagr) from 20.3.2 to 21.0.0.
- [Release notes](https://github.com/ng-packagr/ng-packagr/releases)
- [Changelog](https://github.com/ng-packagr/ng-packagr/blob/main/CHANGELOG.md)
- [Commits](ng-packagr/ng-packagr@20.3.2...21.0.0)

---
updated-dependencies:
- dependency-name: ng-packagr
  dependency-version: 21.0.0
  dependency-type: direct:development
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]