Update memcached stability tag to 2.19.0

Author: wodbot

.env

@@ -89,7 +89,7 @@ OPENSEARCH_ADMIN_PASSWORD=VERY%@bad123password
 
 ADMINER_TAG=4-3.32.1
 APACHE_TAG=2.4-4.15.3
-MEMCACHED_TAG=1-2.18.5
+MEMCACHED_TAG=1-2.19.0
 OPENSMTPD_TAG=7-1.23.1
 RSYSLOG_TAG=latest
 WEBGRIND_TAG=1-1.36.0