Update vip-manager to v2.4.0 (#639)

vars/main.yml

@@ -51,7 +51,7 @@ keepalived_virtual_router_id: "{{ cluster_vip.split('.')[3] | int }}" # The last
 # virtual_router_id - must be unique in the network (available values are 0..255).
 
 # vip-manager (if 'cluster_vip' is specified and 'with_haproxy_load_balancing' is 'false')
-vip_manager_version: "2.3.0"  # version to install
+vip_manager_version: "2.4.0"  # version to install
 vip_manager_conf: "/etc/patroni/vip-manager.yml"
 vip_manager_interval: "1000"  # time (in milliseconds) after which vip-manager wakes up and checks if it needs to register or release ip addresses.
 vip_manager_iface: "{{ vip_interface }}"  # interface to which the virtual ip will be added