libs: update to nfs4j-0.6.2

Changelog for nfs4j-0.6.1..nfs4j-0.6.2
    * [2f24baa] nfsv3: fix creation of symbolic link

Acked-by: Albert Rossi
Target: master, 2.7
Require-book: no
Require-notes: no

pom.xml

@@ -783,7 +783,7 @@
         <dependency>
             <groupId>org.dcache</groupId>
             <artifactId>nfs4j-core</artifactId>
-            <version>0.6.1</version>
+            <version>0.6.2</version>
             <exclusions>
                 <exclusion>
                     <groupId>org.dcache.chimera</groupId>