loc: add sigmanificient to maitainers

pkgs/development/misc/loc/default.nix

···
     description = "Count lines of code quickly";
     mainProgram = "loc";
     license = lib.licenses.mit;
-    maintainers = with lib.maintainers; [ ];
+    maintainers = with lib.maintainers; [ sigmanificient ];
     platforms = platforms.unix;
   };
 }