Use latest documentation plugin

Author: fhanik

build.gradle

@@ -1,6 +1,6 @@
 buildscript {
 	dependencies {
-		classpath 'io.spring.gradle:spring-build-conventions:0.0.28.BUILD-SNAPSHOT'
+		classpath 'io.spring.gradle:spring-build-conventions:0.0.29.BUILD-SNAPSHOT'
 		classpath "org.springframework.boot:spring-boot-gradle-plugin:$springBootVersion"
 		classpath 'io.spring.nohttp:nohttp-gradle:0.0.2.RELEASE'
 		classpath "io.freefair.gradle:aspectj-plugin:4.0.2"