Bump unicode-xid from 0.2.1 to 0.2.2
Bumps [unicode-xid](https://github.com/unicode-rs/unicode-xid) from 0.2.1 to 0.2.2.
- [Release notes](https://github.com/unicode-rs/unicode-xid/releases)
- [Commits](https://github.com/unicode-rs/unicode-xid/commits)
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