Update JGit to 4.9.2.201712150930-r.4-g085d1f959

This is the version used on core Gerrit stable-2.15.

Change-Id: I27e342c2471e161cb3d45cbac887d6085d8e5f90
diff --git a/external_plugin_deps.bzl b/external_plugin_deps.bzl
index 8b4a6ab..065ccfd 100644
--- a/external_plugin_deps.bzl
+++ b/external_plugin_deps.bzl
@@ -1,13 +1,13 @@
 load("//tools/bzl:maven_jar.bzl", "maven_jar", "GERRIT", "MAVEN_LOCAL", "MAVEN_CENTRAL")
 
-JGIT_VERSION = '4.9.0.201710071750-r'
-REPO = MAVEN_CENTRAL
+JGIT_VERSION = '4.9.2.201712150930-r.4-g085d1f959'
+REPO = GERRIT
 
 def external_plugin_deps():
   maven_jar(
     name = 'jgit_http_apache',
     artifact = 'org.eclipse.jgit:org.eclipse.jgit.http.apache:' + JGIT_VERSION,
-    sha1 = '4319a746e2a75d2803875b805702da3ad108386e',
+    sha1 = '13859b30c8a20eb99dca3b9d2bb595e82d90320b',
     repository = REPO,
     unsign = True,
     exclude = [
@@ -19,7 +19,7 @@
   maven_jar(
     name = 'jgit_lfs',
     artifact = 'org.eclipse.jgit:org.eclipse.jgit.lfs:' + JGIT_VERSION,
-    sha1 = '4f6c7536c6459c639736207bf93e7037403b1953',
+    sha1 = '70dea6582f956fbaea003391fac8d79d280a9d24',
     repository = REPO,
     unsign = True,
     exclude = [
@@ -31,7 +31,7 @@
   maven_jar(
     name = 'jgit_lfs_server',
     artifact = 'org.eclipse.jgit:org.eclipse.jgit.lfs.server:' + JGIT_VERSION,
-    sha1 = 'c1e4851ff14681d35e81f47fa25ae3eb1f838436',
+    sha1 = '1e704bf986e2f882666ca3b8ae1446137346b8ee',
     repository = REPO,
     unsign = True,
     exclude = [