Upgrade bazlets to latest stable-2.16

Includes further fixes for --incompatible_disallow_legacy_java_provider.

Change-Id: I09124f0999edb0086ae509de56ffaa0b05024ff2

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index e1ee2c1..7605d87 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "3df1fac2202ac2a42cec61fac8c502178c9af391",
+    commit = "6af2e084b72d38a3375925c4586ac2278ef95ee9",
     #local_path = "/home/<user>/projects/bazlets",
 )