Update dependency org.springframework.boot:spring-boot-starter-parent to v2.5.6

Author: renovate-bot

application/web-java-spring/pom.xml

@@ -6,7 +6,7 @@
 	<parent>
 		<groupId>org.springframework.boot</groupId>
 		<artifactId>spring-boot-starter-parent</artifactId>
-		<version>2.5.5</version>
+		<version>2.5.6</version>
 	</parent>
 	<groupId>webapp.3tier.k8s</groupId>
 	<artifactId>web-java-spring</artifactId>