Update to JGit 0.7.1.74-g16419da

This version of JGit contains a bug fix to work around packs being
closed and removed from the pack list when a thread is interrupted.
This should resolve Gerrit's issue 390 which causes objects (and
branches that point to them) to disappear from the server.

Bug: issue 390
Change-Id: I50a1cd941fe9f0a7dd2a6a15d6bd56a36fc773a0
Change-Id: Ic7bfe313808f56421d18ceb4c76caf74046a62aa
Signed-off-by: Shawn O. Pearce <sop@google.com>
(cherry picked from commit 2366d781b35de7e2e5740560a5877a01e24e44b1)

pom.xml

diff --git a/pom.xml b/pom.xml
index 2c88fd8..6a25f4e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -46,7 +46,7 @@
   </issueManagement>
 
   <properties>
-    <jgitVersion>0.7.1.46-gdd63f5c</jgitVersion>
+    <jgitVersion>0.7.1.74-g16419da</jgitVersion>
     <gwtormVersion>1.1.4</gwtormVersion>
     <gwtjsonrpcVersion>1.2.2</gwtjsonrpcVersion>
     <gwtexpuiVersion>1.2.1</gwtexpuiVersion>