Add GitHub Sponsors link to sponsoring page

Author: simonhamp

resources/views/sponsoring.blade.php

@@ -85,6 +85,11 @@ class="prose mt-2 max-w-none text-gray-600 will-change-transform dark:text-gray-
             </p>
 
             <ul>
+                <li>
+                    <a href="https://github.com/sponsors/nativephp">
+                        GitHub Sponsors
+                    </a>
+                </li>
                 <li>
                     <a href="https://opencollective.com/nativephp">
                         OpenCollective