package/libxml2: security bump version to 2.12.9

Fixes CVE-2024-34459 (2.12.7) & CVE-2024-40896.

Release notes:
https://download.gnome.org/sources/libxml2/2.12/libxml2-2.12.7.news
https://download.gnome.org/sources/libxml2/2.12/libxml2-2.12.8.news
https://download.gnome.org/sources/libxml2/2.12/libxml2-2.12.9.news

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit 45651cdb851bcd5af06bb94d824b078b03d4f187)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libxml2/libxml2.hash

@@ -1,4 +1,4 @@
-# From https://download.gnome.org/sources/libxml2/2.12/libxml2-2.12.6.sha256sum
-sha256  889c593a881a3db5fdd96cc9318c87df34eb648edfc458272ad46fd607353fbb  libxml2-2.12.6.tar.xz
+# From https://download.gnome.org/sources/libxml2/2.12/libxml2-2.12.9.sha256sum
+sha256  59912db536ab56a3996489ea0299768c7bcffe57169f0235e7f962a91f483590  libxml2-2.12.9.tar.xz
 # License files, locally calculated
 sha256  7fb0a66f3989f9bd5c7e5438a3de02cd4a7a47dde0aea2f7ea2ba2ff454ee6a4  Copyright

package/libxml2/libxml2.mk

@@ -5,7 +5,7 @@
 ################################################################################
 
 LIBXML2_VERSION_MAJOR = 2.12
-LIBXML2_VERSION = $(LIBXML2_VERSION_MAJOR).6
+LIBXML2_VERSION = $(LIBXML2_VERSION_MAJOR).9
 LIBXML2_SOURCE = libxml2-$(LIBXML2_VERSION).tar.xz
 LIBXML2_SITE = \
 	https://download.gnome.org/sources/libxml2/$(LIBXML2_VERSION_MAJOR)