nixos/auto-cpufreq: Add nicoo to maintainers

nixos/modules/services/hardware/auto-cpufreq.nix

···
   };
 
   # uses attributes of the linked package
-  meta.buildDocsInSandbox = false;
+  meta = {
+    buildDocsInSandbox = false;
+    maintainers = with lib.maintainers; [ nicoo ];
+  };
 }