Update git submodules

* Update plugins/hooks from branch 'stable-2.16'
  to 47e4b87fca52c5b1dea9ab37833e36fb4f57d3fb
  - Fix source glob in test rule
    
    The glob was only matching files with the name *Test.java which did not
    include HooksIT.java, hence the test was not being executed when run on
    the command line with "bazel test".
    
    Change-Id: If593ad52c24ddd1f633a399f59204fa2a48b0359
    
diff --git a/plugins/hooks b/plugins/hooks
index 16fbec6..47e4b87 160000
--- a/plugins/hooks
+++ b/plugins/hooks
@@ -1 +1 @@
-Subproject commit 16fbec698f99ff80fd415b82f662e0a9042cee3b
+Subproject commit 47e4b87fca52c5b1dea9ab37833e36fb4f57d3fb