Merge branch 'stable-2.15'

* stable-2.15:
  Upgrade jgroups to 3.6.15.Final

Change-Id: Ie8ed67c96eaa3ff7514c67734b31fcd26d530d70
diff --git a/external_plugin_deps.bzl b/external_plugin_deps.bzl
index d1cef79..364369b 100644
--- a/external_plugin_deps.bzl
+++ b/external_plugin_deps.bzl
@@ -40,6 +40,6 @@
 
   maven_jar(
     name = "jgroups",
-    artifact = "org.jgroups:jgroups:3.6.5.Final",
-    sha1 = "fe575fe2d473566ad3f4ace4702ff4bfcf2587a6",
+    artifact = "org.jgroups:jgroups:3.6.15.Final",
+    sha1 = "755afcfc6c8a8ea1e15ef0073417c0b6e8c6d6e4",
   )