Add avif

Signed-off-by: JanisPlayer <54918417+JanisPlayer@users.noreply.github.com>

Author: JanisPlayer

lib/public/Collaboration/Reference/LinkReferenceProvider.php

@@ -60,7 +60,8 @@ class LinkReferenceProvider implements IReferenceProvider {
 		'image/jpeg',
 		'image/gif',
 		'image/svg+xml',
-		'image/webp'
+		'image/webp',
+		'image/avif'
 	];
 
 	/**