updated Maven submodule repository to 1.6.0

diff --git a/maven b/maven
index 689eaec8f3b9f52700e941774c88e018da2b8934..a2beaf6057b732979733da04769fea4ec63bed08 160000 (submodule)
--- a/maven
+++ b/maven
@@ -1 +1 @@
-Subproject commit 689eaec8f3b9f52700e941774c88e018da2b8934
+Subproject commit a2beaf6057b732979733da04769fea4ec63bed08