Dependencies: use Gradle file operations to remove outdated JDK

it throws an exception in case of any problems

build/dependencies/setupJdk.gradle

@@ -43,9 +43,7 @@ task setupJdk18(dependsOn: downloadJdk18) {
 def unpackJdk(jdkArchive, outputDir) {
   logger.info("Unpacking $jdkArchive to ${outputDir}")
   if (file(outputDir).exists()) {
-    if (!file(outputDir).deleteDir()) {
-      throw new Exception("unpackJdk: Unable to delete folder: $outputDir")
-    }
+    delete(outputDir)
   }
   def currentOs = org.gradle.internal.os.OperatingSystem.current()
   if (currentOs.isWindows()) {