Update bazlets to latest revision on stable-2.14

Update bazlets to use GWT version 2.8.2 corresponding to the version
used in core Gerrit since 2.14.6.

Change-Id: I18253a33c0d36b88d5fa00c7b6e4eb087a1f44b3
diff --git a/WORKSPACE b/WORKSPACE
index cd9ae96..b39eeff 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "fb374c7a27fd94b94e5109906c09bc459355cff2",
+    commit = "21e71dc9abb42f5ac80c51d2df2a374c3414b9d2",
     #    local_path = "/home/<user>/projects/bazlets",
 )