package/libxml2: bump version to 2.12.6

https://gitlab.gnome.org/GNOME/libxml2/-/blob/v2.12.6/NEWS

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Arnout Vandecappelle <arnout@mind.be>
(cherry picked from commit f9b1cc87d421356c91c8a9beb35691a35e9adb72)
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/libxml2-2.12.5.sha256sum
-sha256  a972796696afd38073e0f59c283c3a2f5a560b5268b4babc391b286166526b21  libxml2-2.12.5.tar.xz
+# From https://download.gnome.org/sources/libxml2/2.12/libxml2-2.12.6.sha256sum
+sha256  889c593a881a3db5fdd96cc9318c87df34eb648edfc458272ad46fd607353fbb  libxml2-2.12.6.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).5
+LIBXML2_VERSION = $(LIBXML2_VERSION_MAJOR).6
 LIBXML2_SOURCE = libxml2-$(LIBXML2_VERSION).tar.xz
 LIBXML2_SITE = \
 	https://download.gnome.org/sources/libxml2/$(LIBXML2_VERSION_MAJOR)