package/samba4: bump version to 4.18.4

Release notes:
https://www.samba.org/samba/history/samba-4.18.4.html

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
(cherry picked from commit 006badd9b61ec281d656e23009ddc326a94ae39e)
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-4.18.3.tar.asc
-sha256  c67e1453165a3918ffffad600236ca3966b47bde4798e89ae600ae3903ccc32c  samba-4.18.3.tar.gz
+# https://download.samba.org/pub/samba/stable/samba-4.18.4.tar.asc
+sha256  6ba7b3503cc59c9ff4f6fcb1b510c2c855fff93e0b366ab891a32a4732e88e53  samba-4.18.4.tar.gz
 sha256  8ceb4b9ee5adedde47b31e975c1d90c73ad27b6b165a1dcd80c7c545eb65b903  COPYING

package/samba4/samba4.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-SAMBA4_VERSION = 4.18.3
+SAMBA4_VERSION = 4.18.4
 SAMBA4_SITE = https://download.samba.org/pub/samba/stable
 SAMBA4_SOURCE = samba-$(SAMBA4_VERSION).tar.gz
 SAMBA4_INSTALL_STAGING = YES