Change deprecated utf8_encode to mb_convert_encoding

src/Actions/MultiUploadAction.php

@@ -44,7 +44,7 @@ protected function setUp(): void
                     if (! empty($item['exif'])) {
                         array_walk_recursive($item['exif'], function (&$entry) {
                             if (! mb_detect_encoding($entry, 'utf-8', true)) {
-                                $entry = utf8_encode($entry);
+                                $entry = mb_convert_encoding($entry, 'utf-8');
                             }
                         });
                     }