Bumps [github.com/mitchellh/copystructure](https://github.com/mitchellh/copystructure) from 1.1.1 to 1.2.0.
- [Release notes](https://github.com/mitchellh/copystructure/releases)
- [Commits](https://github.com/mitchellh/copystructure/compare/v1.1.1...v1.2.0

)
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