laravel-horizon: fix memcached (#2316)

Fix #2278

laravel-horizon/Dockerfile

@@ -87,7 +87,7 @@ RUN if [ ${INSTALL_MEMCACHED} = true ]; then \
   if [ $(php -r "echo PHP_MAJOR_VERSION;") = "5" ]; then \
   curl -L -o /tmp/memcached.tar.gz "https://github.com/php-memcached-dev/php-memcached/archive/2.2.0.tar.gz"; \
   else \
-  curl -L -o /tmp/memcached.tar.gz "https://github.com/php-memcached-dev/php-memcached/archive/php7.tar.gz"; \
+  curl -L -o /tmp/memcached.tar.gz "https://github.com/php-memcached-dev/php-memcached/archive/v3.1.3.tar.gz"; \
   fi \
   && mkdir -p memcached \
   && tar -C memcached -zxvf /tmp/memcached.tar.gz --strip 1 \