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

Change-Id: I4daa310b1918575176e5fdae492c928f9c84e39b

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index a344e21..8749dd6 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",
 )