Upgrade bazlets to latest stable-2.16 to build with 2.16.12 API

Change-Id: I789287a43c5675969dc282c910cb085552f7b45b

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 4127209..614a271 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "6af2e084b72d38a3375925c4586ac2278ef95ee9",
+    commit = "ec989bb514e39447764057c60d3f9959bff8e153",
     #local_path = "/home/<user>/projects/bazlets",
 )