Upgrade Spring Boot in samples to 2.3.4.RELEASE

kafka-security-samples/kafka-ssl-demo/pom.xml

@@ -5,7 +5,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>2.3.3.RELEASE</version>
+		<version>2.3.4.RELEASE</version>
 		<relativePath/> <!-- lookup parent from repository -->
 	</parent>
 	<groupId>kafka.ssl.demo</groupId>
@@ -15,7 +15,6 @@
 	<description>Demo project for Spring Boot</description>
 
 	<properties>
-		<java.version>11</java.version>
 		<spring-cloud.version>Hoxton.SR8</spring-cloud.version>
 	</properties>
 

kafka-security-samples/pom.xml

@@ -9,10 +9,6 @@
     <description>Kafka Security Samples</description>
     <packaging>pom</packaging>
 
-    <properties>
-        <java.version>8</java.version>
-    </properties>
-
     <modules>
         <module>kafka-ssl-demo</module>
     </modules>