Upgrade bazlets to latest stable-3.1 to build with 3.1.4 API

Change-Id: I4594b75b724af9432eeb0f71de77d3442e8a83d5
diff --git a/WORKSPACE b/WORKSPACE
index ade0398..678ad28 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "65536a2b01b0097ee3237bb48a805ed97ca51467",
+    commit = "fc1bfdf008c4b07e7cc4214fdacf25560276f9c4",
     #local_path = "/home/<user>/projects/bazlets",
 )