Bumps [d3d12](https://github.com/gfx-rs/d3d12-rs) from 0.3.0 to 0.3.1.
- [Release notes](https://github.com/gfx-rs/d3d12-rs/releases)
- [Changelog](https://github.com/gfx-rs/d3d12-rs/blob/master/CHANGELOG.md)
- [Commits](https://github.com/gfx-rs/d3d12-rs/commits)

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