Upgrade bazlets to latest stable-2.16 to build with 2.16.22 API

Change-Id: I55f8b5da1b04f40f12a030ea5e3b7fc0e3ab846d

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 2657b61..922467e 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "56c9f4ed6dbe3c88f793851c88389637f3714a5d",
+    commit = "8ad33887665f4f6adf7cb465a03f6bd81b95e01d",
     #local_path = "/home/<user>/projects/bazlets",
 )