[PATCH] Change xz module due to licensing concerns

The original module `github.com/xi2/xz/` is in the Public Domain but
does not explicitly specify a license. The module has not been updated
since 2017.

The fork at `github.com/therootcompany/xz` simply adds a Creative
Commons CC0 1.0 Universal (CC0-1.0) license declaration for Public
Domain use. However, this license has been disallowed by Fedora since
2022, as announced in the [Fedora Legal
thread](https://lists.fedoraproject.org/archives/list/legal@lists.fedoraproject.org/thread/RRYM3CLYJYW64VSQIXY6IF3TCDZGS6LM/#EO4JUQRG4GDLRHJHJBUZDR2RHMXNU5HT), and the restriction also applies to RHEL and related distributions.

The module at `github.com/mikelolasagasti/xz` is a fork of `xi2/xz`, but
declares the BSD Zero Clause License (0BSD) instead. This aligns with
the licensing of the upstream source from which `xi2/xz` originally
derives, which has moved from [Public Domain to 0BSD for recent
updates](https://tukaani.org/xz/embedded.html#_licensing).

Signed-off-by: Mikel Olasagasti Uranga <mikel@olasagasti.info>

internal/decompress/xz.go

@@ -5,7 +5,7 @@ import (
 	"io"
 	"sync"
 
-	"github.com/therootcompany/xz"
+	"github.com/mikelolasagasti/xz"
 )
 
 type Xz struct {