Upgrade JGit to 5.1.11.201909031202-r

This aligns with the version used in latest core Gerrit 2.16.

Change-Id: Ie63d8ca62e9f4c0dddddd41e29087e2f25ae43ff
diff --git a/external_plugin_deps.bzl b/external_plugin_deps.bzl
index 3adef5f..ae50f37 100644
--- a/external_plugin_deps.bzl
+++ b/external_plugin_deps.bzl
@@ -125,8 +125,8 @@
     maven_jar(
         name = "jgit",
         artifact =
-            "org.eclipse.jgit:org.eclipse.jgit:5.1.5.201812261915-r",
-        sha1 = "e64c71932a2a8fdc2b86cf7d5d61c3399c64b8b1",
+            "org.eclipse.jgit:org.eclipse.jgit:5.1.11.201909031202-r",
+        sha1 = "5aa0e29d7b4db4e6c17e3ddee9bdc8d578f02ef0",
     )
 
     maven_jar(