Replace FileUtils.deleteDirectory(File) with JDK provided API (#162)

Co-authored-by: Moderne <[email protected]>

Author: slachiewicz

src/test/java/org/codehaus/plexus/components/io/filemappers/ResourcesTest.java

@@ -67,7 +67,7 @@ private File getFilesDir() {
 
     private void createFiles() throws IOException {
         final File baseDir = getFilesDir();
-        FileUtils.deleteDirectory(baseDir);
+        org.apache.commons.io.FileUtils.deleteDirectory(baseDir);
         FileUtils.mkdir(baseDir.getPath());
         final File aFile = new File(baseDir, A_PATH);
         FileUtils.mkdir(aFile.getParentFile().getPath());