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

(cherry picked from commit d43cc5db0ff80958ca873df1dc2fa00054e37175)

LICENSE.txt

@@ -1835,7 +1835,7 @@ 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