package/samba4: bump version to 4.21.7

Release notes:
https://www.samba.org/samba/history/samba-4.21.7.html

Signed-off-by: Bernd Kuhls <bernd@kuhls.net>
Signed-off-by: Julien Olivain <ju.o@free.fr>
(cherry picked from commit 282e7add8806bb629c18cc84155542d89746710a)
[Titouan: Bump to 4.21.7 on buildroot 2025.02]
Signed-off-by: Titouan Christophe <titouan.christophe@mind.be>

package/samba4/samba4.hash

@@ -1,4 +1,4 @@
 # Locally calculated after checking pgp signature
-# https://download.samba.org/pub/samba/stable/samba-4.21.6.tar.asc
-sha256  681bad60f57959436350751bc89e893b8c106ac882cc7420f93f419e1d188688  samba-4.21.6.tar.gz
+# https://download.samba.org/pub/samba/stable/samba-4.21.7.tar.asc
+sha256  a395414ee573ef3f5313b274d463866356a53acc7b5e48fb9b5ad83c6ad4a265  samba-4.21.7.tar.gz
 sha256  8ceb4b9ee5adedde47b31e975c1d90c73ad27b6b165a1dcd80c7c545eb65b903  COPYING

package/samba4/samba4.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-SAMBA4_VERSION = 4.21.6
+SAMBA4_VERSION = 4.21.7
 SAMBA4_SITE = https://download.samba.org/pub/samba/stable
 SAMBA4_SOURCE = samba-$(SAMBA4_VERSION).tar.gz
 SAMBA4_INSTALL_STAGING = YES