RFR: 8352162: Update libxml2 to 2.13.8 [v10]

Wed Apr 23 11:45:56 UTC 2025

On Wed, 23 Apr 2025 11:25:10 GMT, Jay Bhaskar <jbhaskar at openjdk.org> wrote:

>> The upgrade is required to address several known issues from the previous version to improve stability and performance.
>
> Jay Bhaskar has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Adding license attribute for thirdparty libs

LGTM

The only change since last approval is the updated third-party README content in `/src/main/legal`, so a single re-review is sufficient.

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Marked as reviewed by kcr (Lead).

PR Review: https://git.openjdk.org/jfx/pull/1785#pullrequestreview-2786995996