Add PHP 8.4 and 8.5 support for memcached

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: ROMB

layers/memcached/config.json

@@ -1,6 +1,8 @@
 {
     "php": [
         "82",
-        "83"
+        "83",
+        "84",
+        "85"
     ]
 }