bump chain-main version

Author: thomas-nguy

default.nix

@@ -39,7 +39,7 @@ let
 in
 buildGoApplication rec {
   pname = "chain-maind";
-  version = "v6.0.2";
+  version = "v6.0.3";
   go = buildPackages.go_1_23;
   src = lib.cleanSourceWith {
     name = "src";