small correction in license header

scripts/license_header_2024.txt

@@ -6,7 +6,7 @@
 // gnss_utils is free software: you can redistribute it and/or modify
 // it under the terms of the GNU Lesser General Public License as published by
 // the Free Software Foundation, either version 3 of the License, or
-// at your option) any later version.
+// (at your option) any later version.
 //
 // This program is distributed in the hope that it will be useful,
 // but WITHOUT ANY WARRANTY; without even the implied warranty of