Upgrade bazlets to latest stable-2.16 to build with 2.16.7 API

Change-Id: I5a90d5393ceec822400d9877b1789ba0372beb3a

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 2d78cf8..a6e318f 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "86562a4c8c2e885aac89eafab34a90571be2ef09",
+    commit = "5c1e201c6835e56a69a980c72206431e2a9d7d80",
     #local_path = "/home/<user>/projects/bazlets",
 )