Upgrade bazlets to latest stable-2.16 to build with 2.16.8 API

Change-Id: Id24aff42933658413704f2887aab1103d2524e84

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 7b4f79b..0949e3b 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "c827ba79413585ab9dfc1bbd0d7f609eedd6aa80",
+    commit = "a5525ae2c43e61cf113dacc03691cb2bcf44fb12",
     #local_path = "/home/<user>/projects/bazlets",
 )