Upgrade to Hazelcast 3.12

Closes gh-16503

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

-<hazelcast xsi:schemaLocation="http://www.hazelcast.com/schema/config hazelcast-config-3.11.xsd"
+<hazelcast xsi:schemaLocation="http://www.hazelcast.com/schema/config hazelcast-config-3.12.xsd"
 		xmlns="http://www.hazelcast.com/schema/config"
 		xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
 	<map name="books"/>

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

 <hazelcast
-		xsi:schemaLocation="http://www.hazelcast.com/schema/config hazelcast-config-3.11.xsd"
+		xsi:schemaLocation="http://www.hazelcast.com/schema/config hazelcast-config-3.12.xsd"
 		xmlns="http://www.hazelcast.com/schema/config"
 		xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
 	<map name="defaultCache" />

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

-<hazelcast xsi:schemaLocation="http://www.hazelcast.com/schema/config hazelcast-config-3.11.xsd"
+<hazelcast xsi:schemaLocation="http://www.hazelcast.com/schema/config hazelcast-config-3.12.xsd"
 		xmlns="http://www.hazelcast.com/schema/config"
 		xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
 	<map name="books"/>

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

 <hazelcast
-		xsi:schemaLocation="http://www.hazelcast.com/schema/config hazelcast-config-3.11.xsd"
+		xsi:schemaLocation="http://www.hazelcast.com/schema/config hazelcast-config-3.12.xsd"
 		xmlns="http://www.hazelcast.com/schema/config"
 		xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
 	<map name="defaultCache" />

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

 <hazelcast
-	xsi:schemaLocation="http://www.hazelcast.com/schema/config hazelcast-config-3.11.xsd"
+	xsi:schemaLocation="http://www.hazelcast.com/schema/config hazelcast-config-3.12.xsd"
 	xmlns="http://www.hazelcast.com/schema/config" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
 	<instance-name>default-instance</instance-name>
 	<map name="defaultCache" />

spring-boot-project/spring-boot-autoconfigure/src/test/resources/org/springframework/boot/autoconfigure/hazelcast/hazelcast-client-specific.xml

 <?xml version="1.0" encoding="UTF-8"?>
 <hazelcast-client xmlns="http://www.hazelcast.com/schema/client-config"
 		xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-		xsi:schemaLocation="http://www.hazelcast.com/schema/client-config hazelcast-client-config-3.11.xsd">
+		xsi:schemaLocation="http://www.hazelcast.com/schema/client-config hazelcast-client-config-3.12.xsd">
 
 </hazelcast-client>

spring-boot-project/spring-boot-autoconfigure/src/test/resources/org/springframework/boot/autoconfigure/hazelcast/hazelcast-specific.xml

-<hazelcast xsi:schemaLocation="http://www.hazelcast.com/schema/config hazelcast-config-3.11.xsd"
+<hazelcast xsi:schemaLocation="http://www.hazelcast.com/schema/config hazelcast-config-3.12.xsd"
 		   xmlns="http://www.hazelcast.com/schema/config"
 		   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
 

spring-boot-project/spring-boot-dependencies/pom.xml

@@ -67,7 +67,7 @@
 		<gson.version>2.8.5</gson.version>
 		<h2.version>1.4.199</h2.version>
 		<hamcrest.version>1.3</hamcrest.version>
-		<hazelcast.version>3.11.2</hazelcast.version>
+		<hazelcast.version>3.12</hazelcast.version>
 		<hazelcast-hibernate5.version>1.3.2</hazelcast-hibernate5.version>
 		<hibernate.version>5.4.2.Final</hibernate.version>
 		<hibernate-validator.version>6.0.16.Final</hibernate-validator.version>

spring-boot-samples/spring-boot-sample-cache/src/main/resources/hazelcast.xml

-<hazelcast xsi:schemaLocation="http://www.hazelcast.com/schema/config hazelcast-config-3.11.xsd"
+<hazelcast xsi:schemaLocation="http://www.hazelcast.com/schema/config hazelcast-config-3.12.xsd"
 		   xmlns="http://www.hazelcast.com/schema/config"
 		   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
 

spring-boot-samples/spring-boot-sample-session/src/main/resources/hazelcast.xml

-<hazelcast xsi:schemaLocation="http://www.hazelcast.com/schema/config hazelcast-config-3.11.xsd"
+<hazelcast xsi:schemaLocation="http://www.hazelcast.com/schema/config hazelcast-config-3.12.xsd"
 		   xmlns="http://www.hazelcast.com/schema/config"
 		   xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">