Bump async-trait from 0.1.48 to 0.1.50 (#8977)

Bumps [async-trait](https://github.com/dtolnay/async-trait) from 0.1.48 to 0.1.50.
- [Release notes](https://github.com/dtolnay/async-trait/releases)
- [Commits](https://github.com/dtolnay/async-trait/compare/0.1.48...0.1.50)

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