ci: update dependency ng-packagr to v12.0.8

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
ng-packagr	12.0.6 -> 12.0.8

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Release Notes

ng-packagr/ng-packagr

### [`v12.0.8`](https://togithub.com/ng-packagr/ng-packagr/releases/v12.0.8) ##### Bug Fixes - error shown multiple times in terminal ([22322e8](https://togithub.com/ng-packagr/ng-packagr/commit/22322e8b3233597831cea8e02ad06a621d5a0b64))

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