[XPU] update nixl to v1.2.0

[zhenwei-intel]

Purpose

follow #45843,

update nixl to v1.2.0 in xpu dockerfile

Test Plan

Test Result

---

Essential Elements of an Effective PR Description Checklist

• The purpose of the PR, such as "Fix some issue (link existing issues this PR will resolve)".
• The test plan, such as providing test command.
• The test results, such as pasting the results comparison before and after, or e2e results
• (Optional) The necessary documentation update, such as updating supported_models.md and examples for a new model.

[zhenwei-intel]

cc @jikunshang , PTAL