Bump unicode-xid from 0.2.5 to 0.2.6

Bumps [unicode-xid](https://github.com/unicode-rs/unicode-xid) from 0.2.5 to 0.2.6.
- [Changelog](https://github.com/unicode-rs/unicode-xid/blob/master/CHANGELOG.md)
- [Commits](unicode-rs/unicode-xid@v0.2.5...v0.2.6)

---
updated-dependencies:
- dependency-name: unicode-xid
  dependency-type: indirect
  update-type: version-update:semver-patch
...

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