XCOMMONS-529: Upgrade to XStream 1.4.6

(cherry picked from commit b6ad7d253542e64060fc69fc8eb13cea34f155a8)
XCOMMONS-554: Upgrade to XStream 1.4.7

(cherry picked from commit 29136a3ac5cde3a79ba81aeef6c9e1fc49ce06a0)