samba: 4.15.3 -> 4.15.5

https://www.openwall.com/lists/oss-security/2022/02/01/1

Fixes: CVE-2021-44141, CVE-2021-44142, CEV-2022-0336
(cherry picked from commit da86fe2cd6)

pkgs/servers/samba/4.x.nix

@@ -45,11 +45,11 @@ with lib;
 
 stdenv.mkDerivation rec {
   pname = "samba";
-  version = "4.15.3";
+  version = "4.15.5";
 
   src = fetchurl {
     url = "mirror://samba/pub/samba/stable/${pname}-${version}.tar.gz";
-    sha256 = "sha256-UZOZQEORVQNFhGdo6k3Q/n/LBOIMK4kbXusC5VVBN9s=";
+    sha256 = "sha256-aRFeM4MZN7pRUb4CR5QxR3Za7OZYunQ/RHQWcq1o0X8=";
   };
 
   outputs = [ "out" "dev" "man" ];