maintainers: add ilyakooo0

maintainers/maintainer-list.nix

···
     githubId = 592849;
     name = "Ilya Kolpakov";
   };
+  ilyakooo0 = {
+    name = "Ilya Kostyuchenko";
+    email = "[e-mail]";
+    github = "ilyakooo0";
+    githubId = 6209627;
+  };
   imalison = {
     email = "[e-mail]";
     github = "IvanMalison";