Upgrade to Maven Help Plugin 3.4.0

Closes gh-34687

buildSrc/build.gradle

@@ -30,7 +30,7 @@ dependencies {
 	implementation("com.gradle:gradle-enterprise-gradle-plugin:3.12.1")
 	implementation("com.tngtech.archunit:archunit:1.0.0")
 	implementation("commons-codec:commons-codec:1.13")
-	implementation("org.apache.maven:maven-embedder:3.6.2")
+	implementation("org.apache.maven:maven-embedder:3.6.3")
 	implementation("org.asciidoctor:asciidoctor-gradle-jvm:3.3.2")
 	implementation("org.jetbrains.kotlin:kotlin-gradle-plugin:${kotlinVersion}")
 	implementation("org.jetbrains.kotlin:kotlin-compiler-embeddable:${kotlinVersion}")

buildSrc/src/main/java/org/springframework/boot/build/mavenplugin/MavenExec.java

@@ -86,8 +86,8 @@ public class MavenExec extends JavaExec {
 			return existing;
 		}
 		return project.getConfigurations().create("maven", (maven) -> {
-			maven.getDependencies().add(project.getDependencies().create("org.apache.maven:maven-embedder:3.6.2"));
-			maven.getDependencies().add(project.getDependencies().create("org.apache.maven:maven-compat:3.6.2"));
+			maven.getDependencies().add(project.getDependencies().create("org.apache.maven:maven-embedder:3.6.3"));
+			maven.getDependencies().add(project.getDependencies().create("org.apache.maven:maven-compat:3.6.3"));
 			maven.getDependencies().add(project.getDependencies().create("org.slf4j:slf4j-simple:1.7.5"));
 			maven.getDependencies()
 				.add(project.getDependencies()

spring-boot-project/spring-boot-dependencies/build.gradle

@@ -862,7 +862,7 @@ bom {
 			]
 		}
 	}
-	library("Maven Help Plugin", "3.3.0") {
+	library("Maven Help Plugin", "3.4.0") {
 		group("org.apache.maven.plugins") {
 			plugins = [
 				"maven-help-plugin"

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

@@ -137,7 +137,7 @@ task xsdResources(type: Sync) {
 }
 
 prepareMavenBinaries {
-	versions "3.9.0", "3.8.5", "3.6.3", "3.5.4"
+	versions "3.9.0", "3.8.5", "3.6.3"
 }
 
 artifacts {