Bump clipboard from 2.0.6 to 2.0.8

Bumps [clipboard](https://github.com/zenorocha/clipboard.js) from 2.0.6 to 2.0.8.
- [Release notes](https://github.com/zenorocha/clipboard.js/releases)
- [Commits](https://github.com/zenorocha/clipboard.js/compare/v2.0.6...v2.0.8

)

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