Bumps [downcast-rs](https://github.com/marcianx/downcast-rs) from 1.0.3 to 1.1.1.
- [Release notes](https://github.com/marcianx/downcast-rs/releases)
- [Changelog](https://github.com/marcianx/downcast-rs/blob/v1.1.1/CHANGELOG.md)
- [Commits](marcianx/downcast-rs@v1.0.3...v1.1.1)

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