chore(deps): remove github.com/xi2/xz

[alexandear]

This PR removes the direct dependency on github.com/xi2/xz because the same functionality exists in the already present github.com/ulikunitz/xz.

Compare:

• xi2/xz.NewReader
• ulikunitz/xz.NewReader

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 69.99%. Comparing base (74e6738) to head (411974a). Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #883 +/- ## ======================================= Coverage 69.99% 69.99% ======================================= Files 22 22 Lines 3076 3076 ======================================= Hits 2153 2153 Misses 718 718 Partials 205 205 ```

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