refactor: OpenRewrite best practices

Use this link to re-run the recipe: https://app.moderne.io/recipes/org.openrewrite.recipes.OpenRewriteBestPractices?organizationId=T3BlblJld3JpdGU%3D

Co-authored-by: Moderne <team@moderne.io>

Author: timtebeek

plugin/src/main/java/org/openrewrite/gradle/RewritePlugin.java

@@ -15,13 +15,11 @@
  */
 package org.openrewrite.gradle;
 
-import groovy.lang.Closure;
 import org.gradle.api.Plugin;
 import org.gradle.api.Project;
 import org.gradle.api.Task;
 import org.gradle.api.artifacts.Configuration;
 import org.gradle.api.artifacts.Dependency;
-import org.gradle.api.artifacts.ExternalModuleDependency;
 import org.gradle.api.artifacts.dsl.DependencyHandler;
 import org.gradle.api.attributes.*;
 import org.gradle.api.attributes.java.TargetJvmEnvironment;