package/samba4: security bump to version 4.15.12

Fixes the following security issue:

- CVE-2022-42898: Samba buffer overflow vulnerabilities on 32-bit systems
  https://www.samba.org/samba/security/CVE-2022-42898.html

Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
(cherry picked from commit 81a02457b0f161d6a0b7c9f2f916d55983e5cb44)
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

package/samba4/samba4.hash

@@ -1,4 +1,4 @@
 # Locally calculated after checking pgp signature
-# https://download.samba.org/pub/samba/stable/samba-4.15.11.tar.asc
-sha256  2f305980d49c7723cbef281fff2b81a2eeafae51e58b5172bb43d9693ef8953b  samba-4.15.11.tar.gz
+# https://download.samba.org/pub/samba/stable/samba-4.15.12.tar.asc
+sha256  5889493d69dc7723be6c3154387fbed38c1cddf93a16da8670d99b7cca33b15e  samba-4.15.12.tar.gz
 sha256  8ceb4b9ee5adedde47b31e975c1d90c73ad27b6b165a1dcd80c7c545eb65b903  COPYING

package/samba4/samba4.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-SAMBA4_VERSION = 4.15.11
+SAMBA4_VERSION = 4.15.12
 SAMBA4_SITE = https://download.samba.org/pub/samba/stable
 SAMBA4_SOURCE = samba-$(SAMBA4_VERSION).tar.gz
 SAMBA4_INSTALL_STAGING = YES