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

Change-Id: I53ea39b9eb2da2198b9175642cd62f6aed5fa2ec
diff --git a/WORKSPACE b/WORKSPACE
index 911d3d4..4a80de8 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",
 )