Upgrade to Spring Boot 2.1.6

closes #1193

Author: joshiste

pom.xml

@@ -35,7 +35,7 @@
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 
         <!-- used dependencies versions -->
-        <spring-boot.version>2.1.4.RELEASE</spring-boot.version>
+        <spring-boot.version>2.1.6.RELEASE</spring-boot.version>
         <spring-cloud.version>Greenwich.SR1</spring-cloud.version>
         <hazelcast-tests.version>3.11.1</hazelcast-tests.version>
         <findbugs-jsr305.version>3.0.2</findbugs-jsr305.version>