Upgrade to spring-javaformat 0.0.6

Closes gh-13932

spring-boot-project/spring-boot-tools/spring-boot-gradle-plugin/build.gradle

@@ -1,8 +1,20 @@
+buildscript {
+	repositories {
+		mavenLocal()
+		mavenCentral()
+	}
+	dependencies {
+		classpath("io.spring.javaformat:spring-javaformat-gradle-plugin:0.0.6")
+	}
+}
+
 plugins {
 	id 'java'
 	id 'eclipse'
 }
 
+apply plugin: 'io.spring.javaformat'
+
 repositories {
 	mavenLocal()
 	mavenCentral()
@@ -29,15 +41,6 @@ test {
 	}
 }
 
-eclipseJdt {
-	inputFile = rootProject.file('../../../eclipse/org.eclipse.jdt.core.prefs')
-	doLast {
-		project.file('.settings/org.eclipse.jdt.ui.prefs').withWriter { writer ->
-			writer << file('../../../eclipse/org.eclipse.jdt.ui.prefs').text
-		}
-	}
-}
-
 javadoc {
 	options {
 		author()