Roll recipe dependencies (trivial).

This is an automated CL created by the recipe roller. This CL rolls recipe
changes from upstream projects (e.g. depot_tools) into downstream projects
(e.g. tools/build).


More info is at https://goo.gl/zkKdpD. Use https://goo.gl/noib3a to file a bug
(or complain)

recipe_engine:
  https://crrev.com/05d9ed6145e2b05b7430fb7306f279fb2e2f19b2 [bundle] allow empty directories. (iannucci@chromium.org)

TBR=iannucci@chromium.org

Change-Id: I98f5d744f11e7de7ce82ad4ee648c367799fabd6
Recipe-Tryjob-Bypass-Reason: Autoroller
Bugdroid-Send-Email: False
Reviewed-on: https://chromium-review.googlesource.com/474685
Reviewed-by: <recipe-roller@chromium.org>
Commit-Queue: <recipe-roller@chromium.org>

infra/config/recipes.cfg

@@ -3,7 +3,7 @@
   "deps": {
     "recipe_engine": {
       "branch": "master",
-      "revision": "168be2068b30c07600603f1ce7fffe8f21348965",
+      "revision": "05d9ed6145e2b05b7430fb7306f279fb2e2f19b2",
       "url": "https://chromium.googlesource.com/external/github.com/luci/recipes-py.git"
     }
   },