Upgrade JGit to 0.4.0-272-g7322ea2

This includes the new cherry-picking support needed by our prior
commit 3d17dbd307034ee21e36b95bd4da1d39e2ad7da8, as well as some
bug fixes related to creating pack files over a dumb transport.

Signed-off-by: Shawn O. Pearce <sop@google.com>
1 file changed