Upgrade bazlets to latest stable-2.16 to build with 2.16.13 API

Change-Id: I51f2ec69b0d8384ed358c18e1e140b29b3874753

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index fc03a1f..9d32d30 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "f2865e0c8cab99715851f84ffa298c97957fff35",
+    commit = "23d849dfd1876c1b4b88efa55a4f716895e33fa3",
     #local_path = "/home/<user>/projects/bazlets",
 )