Upgrade bazlets to build with 2.16.7 API

Change I68b5528fe adapted the code to work with the updated
related changes API, but this only works in the in-tree build.

For the standalone build we also need to update the bazlets
revision to use the correct API version.

Bug: Issue 10386
Change-Id: Ie810f4b76e8f12eefdf63975cbf56afbfb0bf37c
diff --git a/WORKSPACE b/WORKSPACE
index 34d98a8..c001cbe 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "c2227415d5044f8439bd47edffb0f052f8da2ac5",
+    commit = "c827ba79413585ab9dfc1bbd0d7f609eedd6aa80",
     #local_path = "/home/<user>/projects/bazlets",
 )