libxml2: update to 2.9.13

This fixes CVE-2022-23308.

Also switch to GNOME as download source and xz tarball.

Signed-off-by: Michael Heimpold <mhei@heimpold.de>

libs/libxml2/Makefile

@@ -8,12 +8,12 @@
 include $(TOPDIR)/rules.mk
 
 PKG_NAME:=libxml2
-PKG_VERSION:=2.9.12
-PKG_RELEASE:=2
+PKG_VERSION:=2.9.13
+PKG_RELEASE:=1
 
-PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.gz
-PKG_SOURCE_URL:=http://xmlsoft.org/sources/
-PKG_HASH:=c8d6681e38c56f172892c85ddc0852e1fd4b53b4209e7f4ebf17f7e2eae71d92
+PKG_SOURCE:=$(PKG_NAME)-$(PKG_VERSION).tar.xz
+PKG_SOURCE_URL:=@GNOME/libxml2/$(basename $(PKG_VERSION))
+PKG_HASH:=276130602d12fe484ecc03447ee5e759d0465558fbc9d6bd144e3745306ebf0e
 
 PKG_LICENSE:=MIT
 PKG_LICENSE_FILES:=COPYING