Bump JGit to 5ae8d28

Notable updates for Gerrit include:
33c00f334 Implement a snapshotting RefDirectory for use in request scope

$ git log --no-decorate --oneline --no-merges ^5166ded 5ae8d28
5ae8d28fa RefDirectory.delete: Prevent failures when packed-refs is outdated
4f7627be2 RefDirectory.pack: Only rely on packed refs from disk
4652dd956 RefDirectory: Make pack() and commitPackRefs() void
33c00f334 Implement a snapshotting RefDirectory for use in request scope
d7400517b Fix RefDirectoryTest.testGetRefs_LooseSorting_Bug_348834
47f2f3613 PackedBatchRefUpdate: Ensure updates are applied on latest packed refs
bf9b704d1 Record my e-mail change in .mailmap
62a3bf8b9 [releng] Bump japicmp base version
d33b9ab5d PatchApplier: missing @since, and minor formatting
738dacb7f BasePackFetchConnection: support negotiationTip feature
ff7470846 PatchApplierTest: Remove test data with Apache license

Change-Id: Ibe706cd67d12d5afa3c06dc3b998e3dc7b3119f6
Release-Notes: Bump JGit to 5ae8d28
diff --git a/modules/jgit b/modules/jgit
index 5166ded..5ae8d28 160000
--- a/modules/jgit
+++ b/modules/jgit
@@ -1 +1 @@
-Subproject commit 5166ded0986df7a99bbc9ae6bc057a27a1e7d974
+Subproject commit 5ae8d28faaf6168921f673c89a4e6d601ffad78d