Upgrade JGit to 5cd485e5
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: I5a86a2bf615e6defe7b64119155affc988b96218

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