Replace xz library with newer one

[der-eismann]

Reasoning:

• Last commit in this repo was 7 years ago, project is dead
• It's not versioned and doesn't have a go.mod
• License can't be detected by pkg.go.dev & other tools
• Causes pkg.go.dev to not show any documentation
• Tools that check for license compliance might fail on embedded-postgres because it pulls in github.com/xi2/xz

[fergusstrange]

Awesome @der-eismann, would be be a great upgrade.

[Araoz-Lucas-bah]

can we move forward with this change? I want to include this in one of my projects, but the license check tooling is failing on this exact thing

[der-eismann]

Unfortunately I have no idea why the tests on Windows and macOS are failing, I can't reproduce it here.

[fergusstrange]

Hmmm this is interesting @der-eismann. I can confirm your changes pass locally with an M2 Macbook. Perhaps try boosting the windows/mac build runners to see if you have any luck here?