Upgrade Gradle plugins

Author: bclozel

build.gradle

@@ -1,12 +1,12 @@
 plugins {
-	id 'io.spring.dependency-management' version '1.0.8.RELEASE' apply false
+	id 'io.spring.dependency-management' version '1.0.9.RELEASE' apply false
 	id 'org.jetbrains.kotlin.jvm' version '1.3.72' apply false
 	id 'org.jetbrains.dokka' version '0.10.1' apply false
 	id 'org.asciidoctor.jvm.convert' version '2.4.0'
 	id 'io.spring.nohttp' version '0.0.4.RELEASE'
-	id 'de.undercouch.download' version '4.0.0'
-	id "io.freefair.aspectj" version '4.1.1' apply false
-	id "com.github.ben-manes.versions" version '0.24.0'
+	id 'de.undercouch.download' version '4.0.4'
+	id "io.freefair.aspectj" version '5.0.0' apply false
+	id "com.github.ben-manes.versions" version '0.28.0'
 }
 
 ext {

gradle/docs.gradle

@@ -3,7 +3,7 @@ configurations {
 }
 
 dependencies {
-	asciidoctorExt("io.spring.asciidoctor:spring-asciidoctor-extensions-block-switch:0.4.0.RELEASE")
+	asciidoctorExt("io.spring.asciidoctor:spring-asciidoctor-extensions-block-switch:0.4.2.RELEASE")
 }
 
 repositories {