Fix memory leakage via Library in KotlinMavenImporter

Relates to #KT-38407

idea/idea-maven/src/org/jetbrains/kotlin/idea/maven/KotlinMavenImporter.kt

@@ -13,7 +13,7 @@ import com.intellij.openapi.externalSystem.service.project.IdeModifiableModelsPr
 import com.intellij.openapi.module.Module
 import com.intellij.openapi.roots.*
 import com.intellij.openapi.roots.impl.libraries.LibraryEx
-import com.intellij.openapi.roots.libraries.Library
+import com.intellij.openapi.util.Disposer
 import com.intellij.util.PathUtil
 import org.jdom.Element
 import org.jdom.Text
@@ -119,14 +119,18 @@ class KotlinMavenImporter : MavenImporter(KOTLIN_PLUGIN_GROUP_ID, KOTLIN_PLUGIN_
         val artifacts = mavenProject.dependencyArtifactIndex.data[KOTLIN_PLUGIN_GROUP_ID]?.values?.flatMap { it.filter { it.isResolved } }
             ?: emptyList()
 
-        val librariesWithNoSources = ArrayList<Library>()
+        val libraryNames = mutableSetOf<String?>()
         OrderEnumerator.orderEntries(module).forEachLibrary { library ->
-            if (library.modifiableModel.getFiles(OrderRootType.SOURCES).isEmpty()) {
-                librariesWithNoSources.add(library)
+            val model = library.modifiableModel
+            try {
+                if (model.getFiles(OrderRootType.SOURCES).isEmpty()) {
+                    libraryNames.add(library.name)
+                }
+            } finally {
+                Disposer.dispose(model)
             }
             true
         }
-        val libraryNames = librariesWithNoSources.mapTo(HashSet()) { it.name }
         val toBeDownloaded = artifacts.filter { it.libraryName in libraryNames }
 
         if (toBeDownloaded.isNotEmpty()) {