Merge pull request #124953 from NixOS/backport-124732-to-release-21.05

[Backport release-21.05] icinga2: 2.12.3 -> 2.12.4

pkgs/servers/monitoring/icinga2/default.nix

···
 
 stdenv.mkDerivation rec {
   pname = "icinga2${nameSuffix}";
-  version = "2.12.3";
+  version = "2.12.4";
 
   src = fetchFromGitHub {
     owner = "icinga";
     repo = "icinga2";
     rev = "v${version}";
-    sha256 = "0pq6ixv7d9bqys8qjxqq0jki3zncj8jdfavkp7qw125iyfjq48xk";
+    sha256 = "sha256-SJBOZzLbmW4525G3w6BVS53kOd2bJ5rEbwwb4Lo5q8I=";
   };
 
   patches = [