Bump @angular/cli from 9.1.7 to 9.1.8 (#5264)

Bumps [@angular/cli](https://github.com/angular/angular-cli) from 9.1.7 to 9.1.8.
- [Release notes](https://github.com/angular/angular-cli/releases)
- [Commits](angular/angular-cli@v9.1.7...v9.1.8)

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

Co-authored-by: dependabot-preview[bot] <27856297+dependabot-preview[bot]@users.noreply.github.com>