leiningen: remove thiagokokada from maintainers

pkgs/development/tools/build-managers/leiningen/default.nix

···
     sourceProvenance = with lib.sourceTypes; [ binaryBytecode ];
     license = lib.licenses.epl10;
     platforms = lib.platforms.linux ++ lib.platforms.darwin;
-    maintainers = with lib.maintainers; [ thiagokokada ];
+    maintainers = with lib.maintainers; [ ];
     mainProgram = "lein";
   };
 }