Bumps [@angular/language-service](https://github.com/angular/angular/tree/HEAD/packages/language-service) from 11.2.12 to 12.0.0.
- [Release notes](https://github.com/angular/angular/releases)
- [Changelog](https://github.com/angular/angular/blob/master/CHANGELOG.md)
- [Commits](https://github.com/angular/angular/commits/12.0.0/packages/language-service)
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