tools: xz: update to 5.6.4
The serious liblzma backdoor vulnerability (CVE-2024-3094) has
been fixed since v5.6.2. It's time to bump this tool to the
latest version. This patch also added a new GitHub package URL.
Changelogs:
https://github.com/tukaani-project/xz/releases/tag/v5.6.2
https://github.com/tukaani-project/xz/releases/tag/v5.6.3
https://github.com/tukaani-project/xz/releases/tag/v5.6.4
Signed-off-by: Shiji Yang <yangshiji66@qq.com>
Link: https://github.com/openwrt/openwrt/pull/18063
Signed-off-by: Nick Hainke <vincent@systemli.org>