increase somaxcon to match new linux default value

etc/sysctl.d/99-custom-hosting.conf

@@ -1,7 +1,7 @@
 net.ipv4.tcp_fin_timeout = 30
 net.ipv4.ip_local_port_range = 1024 65535
 net.ipv4.tcp_fastopen = 3
-net.core.somaxconn = 2048
+net.core.somaxconn = 4096
 net.core.netdev_max_backlog = 5000
 vm.swappiness=1
 vm.dirty_ratio = 40