HADOOP-15900. Update JSch versions in LICENSE.txt.

LICENSE.txt

@@ -1836,7 +1836,7 @@ any resulting litigation.
 
 The binary distribution of this product bundles these dependencies under the
 following license:
-JSch 0.1.51
+JSch 0.1.54
 ParaNamer Core 2.3
 JLine 0.9.94
 leveldbjni-all 1.8