Upgrade bazlets to latest stable-2.16

download_file.py: Fix root workspace directory detection

Change-Id: I26017fc180b761feba2b5f01d4eb7a0e7c7b690c
diff --git a/WORKSPACE b/WORKSPACE
index 0bede7c..d5f0e0a 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "e1360b49f90930e280f6a43380ab533705c85446",
+    commit = "f2865e0c8cab99715851f84ffa298c97957fff35",
     #local_path = "/home/<user>/projects/bazlets",
 )