Update Soy and JGit dependencies

Change-Id: I8896109319655c0334f9b38efcc3bbe727c90ca7

lib/BUCK

diff --git a/lib/BUCK b/lib/BUCK
index 45011ed..5a6c80e 100644
--- a/lib/BUCK
+++ b/lib/BUCK
@@ -8,8 +8,8 @@
 
 maven_jar(
   name = 'soy',
-  id = 'com.google.template:soy:2011-22-12',
-  sha1 = '018c567dd937176a3c4f81623b899cea3fe61458',
+  id = 'com.google.template:soy:2012-12-21',
+  sha1 = 'cc28da103845a0f08cfd3fa5abdd45899b0adae1',
 )
 
 maven_jar(