Update JGit to 5.2.0.201812061821-r

Notable new features
- enhance UploadPack v2 protocol support
- new ssh client based on MINA sshd

Release notes
https://projects.eclipse.org/projects/technology.jgit/releases/5.2.0

Change-Id: I8c97212ea50b149683e373b8a66fa7436ba8da9f

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 252b127..1815663 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -147,7 +147,7 @@
     sha1 = "198ea005f41219f038f4291f0b0e9f3259730e92",
 )
 
-JGIT_VERS = "5.1.3.201810200350-r"
+JGIT_VERS = "5.2.0.201812061821-r"
 
 JGIT_REPO = MAVEN_CENTRAL
 
@@ -155,28 +155,28 @@
     name = "jgit_lib",
     artifact = "org.eclipse.jgit:org.eclipse.jgit:" + JGIT_VERS,
     repository = JGIT_REPO,
-    sha1 = "f270dbd1d792d5ad06074abe018a18644c90b60e",
+    sha1 = "250269f30458084777a480895e390d2a42143da3",
 )
 
 maven_jar(
     name = "jgit_servlet",
     artifact = "org.eclipse.jgit:org.eclipse.jgit.http.server:" + JGIT_VERS,
     repository = JGIT_REPO,
-    sha1 = "360405244c28b537f0eafdc0b9d9f3753503d981",
+    sha1 = "5d7fbe1c8528d881e2987c75e512df2cfa408d73",
 )
 
 maven_jar(
     name = "jgit_junit",
     artifact = "org.eclipse.jgit:org.eclipse.jgit.junit:" + JGIT_VERS,
     repository = JGIT_REPO,
-    sha1 = "1dc8f86bba3c461cb90c9dc3e91bf343889ca684",
+    sha1 = "723b9e6c54f8b3012dd7d4fe42b616b8d10ee230",
 )
 
 maven_jar(
     name = "jgit_archive",
     artifact = "org.eclipse.jgit:org.eclipse.jgit.archive:" + JGIT_VERS,
     repository = JGIT_REPO,
-    sha1 = "08e10921fcc75ead2736dd5bf099ba8e2ed8a3fb",
+    sha1 = "6e49b0516b46ca90d394256d40c6069cdd8f2957",
 )
 
 maven_jar(