bump xero from 5220a42 to 8a02dc4 (#1093)

Bumps [xero](https://github.com/xero/dotfiles) from `5220a42` to `8a02dc4`.
- [Release notes](https://github.com/xero/dotfiles/releases)
- [Commits](xero/dotfiles@5220a42...8a02dc4)

---
updated-dependencies:
- dependency-name: xero
  dependency-type: direct:production
...

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