Upgrade JGit to 4.7.9.201904161809-r

This release fixes a regression that was introduced in the previous
release, where an infinite loop could occur when an object was not
found in the packfile and `core.trustfolderstat` was set to `false`.

Bug: Issue 10695
Change-Id: I11c1a5659f3d495fd78d3cdbc1733b816927a598

lib/jgit/jgit.bzl

@@ -1,6 +1,6 @@
 load("//tools/bzl:maven_jar.bzl", "MAVEN_CENTRAL", "maven_jar")
 
-_JGIT_VERS = "4.7.8.201903121755-r"
+_JGIT_VERS = "4.7.9.201904161809-r"
 
 _DOC_VERS = _JGIT_VERS  # Set to _JGIT_VERS unless using a snapshot
 
@@ -35,28 +35,28 @@ def jgit_maven_repos():
         name = "jgit-lib",
         artifact = "org.eclipse.jgit:org.eclipse.jgit:" + _JGIT_VERS,
         repository = _JGIT_REPO,
-        sha1 = "d168acb5ec4a84589d9de9c6e0050d11ea7d070c",
-        src_sha1 = "301ede02c84f679c9b3ad5bbbca4485f7c1f7cb3",
+        sha1 = "14fb9628876e69d1921776c84c7343ddabe7db31",
+        src_sha1 = "6717cab511548f01f07db2442d104ba901402d49",
         unsign = True,
     )
     maven_jar(
         name = "jgit-servlet",
         artifact = "org.eclipse.jgit:org.eclipse.jgit.http.server:" + _JGIT_VERS,
         repository = _JGIT_REPO,
-        sha1 = "d6390f85adeb78f238826820a42479e9c82410ed",
+        sha1 = "4b9006c68e257e4397a34a6022c6729c657129d8",
         unsign = True,
     )
     maven_jar(
         name = "jgit-archive",
         artifact = "org.eclipse.jgit:org.eclipse.jgit.archive:" + _JGIT_VERS,
         repository = _JGIT_REPO,
-        sha1 = "713a58d64738d6b289983436f1f6d29904639c14",
+        sha1 = "41fb617b0d51afb2f6c1345e8ef57f3caece790a",
     )
     maven_jar(
         name = "jgit-junit",
         artifact = "org.eclipse.jgit:org.eclipse.jgit.junit:" + _JGIT_VERS,
         repository = _JGIT_REPO,
-        sha1 = "cea8dced85441fd3bad429a2417cffad145e87b5",
+        sha1 = "10ad697deb13a90b957e462589fb92a5cf371909",
         unsign = True,
     )