Polish Hazelcast configuration

This commit updates the XSD to 4.2 and removes the "tcp-ip" network
option as it is disabled by default.

See gh-31863

spring-boot-project/spring-boot-actuator/src/test/resources/hazelcast-3.xml

@@ -6,7 +6,6 @@
 	<map name="defaultCache"/>
 	<network>
 		<join>
-			<tcp-ip enabled="false"/>
 			<multicast enabled="false"/>
 		</join>
 	</network>

spring-boot-project/spring-boot-actuator/src/test/resources/hazelcast.xml

@@ -1,12 +1,11 @@
 <hazelcast xmlns="http://www.hazelcast.com/schema/config"
 		   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 		   xsi:schemaLocation="http://www.hazelcast.com/schema/config
-           http://www.hazelcast.com/schema/config/hazelcast-config-4.0.xsd">
+           http://www.hazelcast.com/schema/config/hazelcast-config-4.2.xsd">
 	<instance-name>actuator-hazelcast</instance-name>
 	<map name="defaultCache" />
 	<network>
 		<join>
-			<tcp-ip enabled="false"/>
 			<multicast enabled="false"/>
 		</join>
 	</network>