Bump @angular-devkit/build-angular from 0.901.7 to 0.901.8 (#291)

Bumps [@angular-devkit/build-angular](https://github.com/angular/angular-cli) from 0.901.7 to 0.901.8.
- [Release notes](https://github.com/angular/angular-cli/releases)
- [Commits](https://github.com/angular/angular-cli/commits)

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Author: dependabot-preview[bot]