exim: 4.92.2 -> 4.92.3

security update: CVE-2019-16928

pkgs/servers/mail/exim/default.nix

···
 }:
 
 stdenv.mkDerivation rec {
-  name = "exim-4.92.2";
+  name = "exim-4.92.3";
 
   src = fetchurl {
     url = "https://ftp.exim.org/pub/exim/exim4/${name}.tar.xz";
-    sha256 = "0m56jsh2fzvwj4rdpcc3pkd5vsi40cjrpzalis7l1zq33m4axmq1";
+    sha256 = "1zfj4zblv5881qxpzkrg3f6a96pbcq270s9p6p1w85lfxjsknif4";
   };
 
   nativeBuildInputs = [ pkgconfig ];