RFR: 8352162: Update libxml2 to 2.13.8 [v9]

[Joeri Sykora]

On Tue, 22 Apr 2025 10:32:41 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:
> 
>   add quotes

The builds ran successfully with these changes.

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Marked as reviewed by sykora (Author).

PR Review: https://git.openjdk.org/jfx/pull/1785#pullrequestreview-2786883388