Upgrade to Detekt 2.0.0-alpha.0

We need to upgrade for better compatibility with Java 25.

See gh-47413

buildSrc/build.gradle

@@ -52,7 +52,7 @@ dependencies {
 	implementation("commons-codec:commons-codec:${commonsCodecVersion}")
 	implementation("de.undercouch.download:de.undercouch.download.gradle.plugin:5.5.0")
 	implementation("dev.adamko.dokkatoo:dokkatoo-plugin:2.3.1")
-	implementation("io.gitlab.arturbosch.detekt:detekt-gradle-plugin:1.23.8")
+	implementation("dev.detekt:detekt-gradle-plugin:2.0.0-alpha.0")
 	implementation("io.spring.gradle.antora:spring-antora-plugin:0.0.1")
 	implementation("io.spring.javaformat:spring-javaformat-gradle-plugin:${javaFormatVersion}")
 	implementation("io.spring.nohttp:nohttp-gradle:0.0.11")

buildSrc/src/main/java/org/springframework/boot/build/KotlinConventions.java

@@ -20,9 +20,9 @@ import java.net.URI;
 
 import dev.adamko.dokkatoo.DokkatooExtension;
 import dev.adamko.dokkatoo.formats.DokkatooHtmlPlugin;
-import io.gitlab.arturbosch.detekt.Detekt;
-import io.gitlab.arturbosch.detekt.DetektPlugin;
-import io.gitlab.arturbosch.detekt.extensions.DetektExtension;
+import dev.detekt.gradle.Detekt;
+import dev.detekt.gradle.extensions.DetektExtension;
+import dev.detekt.gradle.plugin.DetektPlugin;
 import org.gradle.api.Project;
 import org.gradle.api.tasks.SourceSet;
 import org.gradle.api.tasks.SourceSetContainer;
@@ -103,7 +103,9 @@ class KotlinConventions {
 		project.getPlugins().apply(DetektPlugin.class);
 		DetektExtension detekt = project.getExtensions().getByType(DetektExtension.class);
 		detekt.getConfig().setFrom(project.getRootProject().file("config/detekt/config.yml"));
-		project.getTasks().withType(Detekt.class).configureEach((task) -> task.setJvmTarget(JVM_TARGET.getTarget()));
+		project.getTasks()
+			.withType(Detekt.class)
+			.configureEach((task) -> task.getJvmTarget().set(JVM_TARGET.getTarget()));
 	}
 
 }

config/detekt/config.yml

@@ -19,7 +19,7 @@ style:
     active: true
   NewLineAtEndOfFile:
     active: true
-  UnusedImports:
+  UnusedImport:
     active: true
   WildcardImport:
     active: true