maintainers: add dkudriavtsev

I plan to add several packages and would like to add myself as a maintainer.

maintainers/maintainer-list.nix

@@ -1655,6 +1655,12 @@
     githubId = 1316469;
     name = "Naomi Morse";
   };
+  dkudriavtsev = {
+    email = "dkudriavtsev@gmail.com";
+    github = "dkudriavtsev";
+    githubId = 9790772;
+    name = "Dmitry Kudriavtsev";
+  };
   dmalikov = {
     email = "malikov.d.y@gmail.com";
     github = "dmalikov";