Move away from ProjectDependency#getDependencyProject()

Closes gh-42870

Author: wilkinsona

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

@@ -17,8 +17,6 @@
 package org.springframework.boot.build;
 
 import java.io.File;
-import java.util.HashMap;
-import java.util.Map;
 
 import org.gradle.api.Action;
 import org.gradle.api.Plugin;
@@ -97,10 +95,11 @@ private void addMavenRepositoryDependencies(Project project, String sourceConfig
 			.getDependencies()
 			.withType(ProjectDependency.class)
 			.all((dependency) -> {
-				Map<String, String> dependencyDescriptor = new HashMap<>();
-				dependencyDescriptor.put("path", dependency.getDependencyProject().getPath());
-				dependencyDescriptor.put("configuration", MAVEN_REPOSITORY_CONFIGURATION_NAME);
-				target.add(project.getDependencies().project(dependencyDescriptor));
+				ProjectDependency copy = dependency.copy();
+				if (copy.getAttributes().isEmpty()) {
+					copy.setTargetConfiguration(MAVEN_REPOSITORY_CONFIGURATION_NAME);
+				}
+				target.add(copy);
 			});
 	}