unpack mojo suffers from PLXUTILS-64

Unpacking a tar.gz file with dependency:unpack I got this

org.codehaus.plexus.archiver.ArchiverException: chmod exit code was: 1
	at org.codehaus.plexus.archiver.util.ArchiveEntryUtils.chmod(ArchiveEntryUtils.java:59)
	at org.codehaus.plexus.archiver.zip.AbstractZipUnArchiver.extractFile(AbstractZipUnArchiver.java:236)
	at org.codehaus.plexus.archiver.tar.TarUnArchiver.execute(TarUnArchiver.java:92)

The problem stems from PLXUTILS-64. The dependency on plexus-utils should be upgraded to at least
version 1.5.1 to prevent this problem.

I tested with this as a plugin dependency and the problem went away.

<dependency>
<groupId>org.codehaus.plexus</groupId>
<artifactId>plexus-utils</artifactId>
<version>1.5.15</version>
</dependency>