Upgrade bazlets to latest master to build with 3.1.0 API

Bug: Issue 12065
Change-Id: I5dc154f6ae2e6c971f1bc24a17290a89e740bd3d
diff --git a/WORKSPACE b/WORKSPACE
index 4005492..c562660 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "7111147b7cf9d9cd4d61f414c815f736f56f0de0",
+    commit = "5f7ca2e226195c2de6eece2c160a9a7690dc7be8",
     #local_path = "/home/<user>/projects/bazlets",
 )