package/samba4: bump version to 4.15.7

Release notes: https://www.samba.org/samba/history/samba-4.15.7.html

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
(cherry picked from commit e57a4e0c75e6127addf62652ba57e52b2df2a83e)
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-4.15.6.tar.asc
-sha256  0575b999a9048445820428dc540ba8a9527ce596fa66af02ea2ba1ea9578bcb4  samba-4.15.6.tar.gz
+# https://download.samba.org/pub/samba/stable/samba-4.15.7.tar.asc
+sha256  76d0096c16ed0265b337d5731f3c0b32eed3adab6fa8b7585c055b287cd05d6b  samba-4.15.7.tar.gz
 sha256  8ceb4b9ee5adedde47b31e975c1d90c73ad27b6b165a1dcd80c7c545eb65b903  COPYING

package/samba4/samba4.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-SAMBA4_VERSION = 4.15.6
+SAMBA4_VERSION = 4.15.7
 SAMBA4_SITE = https://download.samba.org/pub/samba/stable
 SAMBA4_SOURCE = samba-$(SAMBA4_VERSION).tar.gz
 SAMBA4_INSTALL_STAGING = YES