Upgrade bazlets to latest revision

Change-Id: I5a78d9a500974b7f66df594ae2eea1e9774f412a

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 54de006..125c61f 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//tools:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "a8a04c9ef2f131816c1e458613bee93b461ba652",
+    commit = "42244973783cd0b14c5dc24014a97c4148488d6a",
     # local_path = "/home/<user>/projects/bazlets",
 )