CI: update memcached service to 1.6.41 (#663)

Author: nateberkopec

.github/workflows/ci.yml

@@ -19,7 +19,7 @@ jobs:
         ports:
           - 6379:6379
       memcached:
-        image: memcached:1.6.9
+        image: memcached:1.6.41
         ports:
           - 11211:11211
         options: --health-cmd "timeout 5 bash -c 'cat < /dev/null > /dev/udp/127.0.0.1/11211'" --health-interval 10s --health-timeout 5s --health-retries 5