[3.0] Contribs: update libxml2 to 2.9.14

Fixes notably: CVE-2018-9251 CVE-2018-14567 CVE-2018-14404 CVE-2021-3541 CVE-2022-23308 CVE-2022-29824

And move to the official Gnome Infrastructure

(cherry picked from commit 471fd489) Signed-off-by: Jean-Baptiste Kempf jb@videolan.org

changed milestone to %3.0.18

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added 19 commits

• 698a8514...6fe773f8 - 18 commits from branch videolan:3.0.x
• ac996441 - Contribs: update libxml2 to 2.9.14

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