package/samba4: security bump version to 4.18.8

Release notes: https://www.samba.org/samba/history/samba-4.18.8.html

Fixes CVE-2023-3961, CVE-2023-4091, CVE-2023-4154,  CVE-2023-42669 &
CVE-2023-42670.

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 2dc61bfa768659ffa208b179967c332e6252d5ad)
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-4.18.7.tar.asc
-sha256  61559a694f6a13cdc635c2d0e302519756f5f7bee9a61ceab3dc3ceff52160f6  samba-4.18.7.tar.gz
+# https://download.samba.org/pub/samba/stable/samba-4.18.8.tar.asc
+sha256  4fb87bceaeb01d832a59046c197a044b7e8e8000581548b5d577a6cda03344d1  samba-4.18.8.tar.gz
 sha256  8ceb4b9ee5adedde47b31e975c1d90c73ad27b6b165a1dcd80c7c545eb65b903  COPYING

package/samba4/samba4.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-SAMBA4_VERSION = 4.18.7
+SAMBA4_VERSION = 4.18.8
 SAMBA4_SITE = https://download.samba.org/pub/samba/stable
 SAMBA4_SOURCE = samba-$(SAMBA4_VERSION).tar.gz
 SAMBA4_INSTALL_STAGING = YES