package/libxml2: security bump to version 2.10.4

- [CVE-2023-29469] Hashing of empty dict strings isn't deterministic
- [CVE-2023-28484] Fix null deref in xmlSchemaFixupComplexType
- schemas: Fix null-pointer-deref in xmlSchemaCheckCOSSTDerivedOK

https://gitlab.gnome.org/GNOME/libxml2/-/tags/v2.10.4

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 162053090f891036106a5c70f423eb7fbdb8ca4a)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/libxml2/libxml2.hash

@@ -1,4 +1,4 @@
-# From https://download.gnome.org/sources/libxml2/2.10/libxml2-2.10.3.sha256sum
-sha256  5d2cc3d78bec3dbe212a9d7fa629ada25a7da928af432c93060ff5c17ee28a9c  libxml2-2.10.3.tar.xz
+# From https://download.gnome.org/sources/libxml2/2.10/libxml2-2.10.4.sha256sum
+sha256  ed0c91c5845008f1936739e4eee2035531c1c94742c6541f44ee66d885948d45  libxml2-2.10.4.tar.xz
 # License files, locally calculated
 sha256  c5c63674f8a83c4d2e385d96d1c670a03cb871ba2927755467017317878574bd  Copyright

package/libxml2/libxml2.mk

@@ -5,7 +5,7 @@
 ################################################################################
 
 LIBXML2_VERSION_MAJOR = 2.10
-LIBXML2_VERSION = $(LIBXML2_VERSION_MAJOR).3
+LIBXML2_VERSION = $(LIBXML2_VERSION_MAJOR).4
 LIBXML2_SOURCE = libxml2-$(LIBXML2_VERSION).tar.xz
 LIBXML2_SITE = \
 	https://download.gnome.org/sources/libxml2/$(LIBXML2_VERSION_MAJOR)