Bump crossbeam-deque from 0.8.0 to 0.8.1 (#521)

Bumps [crossbeam-deque](https://github.com/crossbeam-rs/crossbeam) from 0.8.0 to 0.8.1.
- [Release notes](https://github.com/crossbeam-rs/crossbeam/releases)
- [Changelog](https://github.com/crossbeam-rs/crossbeam/blob/master/CHANGELOG.md)
- [Commits](crossbeam-rs/crossbeam@crossbeam-deque-0.8.0...crossbeam-deque-0.8.1)

---
updated-dependencies:
- dependency-name: crossbeam-deque
  dependency-type: indirect
...

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