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.
recipe_engine:
  https://crrev.com/fb848fdb71cd25df01eba89b30d5e90ffe138c1d Update docs referring to deprecated 'simulation_test' command (phajdan.jr@chromium.org)

TBR=iannucci@chromium.org

Change-Id: I718401eb2ca7c51db743c961cb7dfb2232750b77
Recipe-Tryjob-Bypass-Reason: Autoroller
Bugdroid-Send-Email: False
Reviewed-on: https://chromium-review.googlesource.com/481119
Reviewed-by: <recipe-roller@chromium.org>
Commit-Queue: <recipe-roller@chromium.org>

infra/config/recipes.cfg

@@ -15,7 +15,7 @@
   "deps": {
     "recipe_engine": {
       "branch": "master",
-      "revision": "d4e0f46079a50a1707240e214809bf4bbac63bc6",
+      "revision": "fb848fdb71cd25df01eba89b30d5e90ffe138c1d",
       "url": "https://chromium.googlesource.com/external/github.com/luci/recipes-py.git"
     }
   },