Upgrade bazlets to latest stable-2.16 to build with 2.16.9 API

Change-Id: Ic01385ce92734a63df562deb2ccd0161ef4e3de2

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 2048b9a..f05c65e 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "d100b6aad6b37e7db8fa141020c882dc97fb7723",
+    commit = "8105536e13d04c7c595a56ce21867471ce47b36d",
     #local_path = "/home/<user>/projects/bazlets",
 )