Use non-deprecated method

Author: gesellix

api-client/src/test/java/de/gesellix/docker/remote/api/testutil/TarUtil.java

@@ -25,7 +25,7 @@ public File unTar(InputStream tar) throws IOException {
 
     TarArchiveInputStream tis = new TarArchiveInputStream(tar);
     TarArchiveEntry tarEntry;
-    while ((tarEntry = tis.getNextTarEntry()) != null) {
+    while ((tarEntry = tis.getNextEntry()) != null) {
       File outputFile = new File(destDir, tarEntry.getName());
       if (tarEntry.isDirectory()) {
         if (!outputFile.exists()) {