Upgrade bazlets to latest stable-2.16 to build with 2.16.6 API

Change-Id: I08bbe3327191e4cae7c73e256d048532c60b7cea

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 682b59a..32cb91c 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "b084bd74743f4303971a2a057bcea4f3352ddf4e",
+    commit = "f7986f2d3e76ae0ca12a8c43ee91205725bd95e2",
     #local_path = "/home/<user>/projects/bazlets",
 )