Upgrade JGit to 5cd485e5

This version contains the following fix:

Ensure that GC#deleteOrphans respects pack lock

If pack or index files are guarded by a pack lock (.keep file)
deleteOrphans() should not touch the respective files protected by the
lock file. Otherwise it may interfere with PackInserter concurrently
inserting a new pack file and its index.

Bug: Issue 13544
Change-Id: I656ba9b6a718857742fb4744a32dac8db654fa07

modules/jgit

diff --git a/modules/jgit b/modules/jgit
index e2663a8..5cd485e 160000
--- a/modules/jgit
+++ b/modules/jgit
@@ -1 +1 @@
-Subproject commit e2663a8b85cf92f6a84d72834257243a84066e9d
+Subproject commit 5cd485e5dda41d2ef06226a692c64f1aa221eb25