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/6c19ddf62e5c5cdcfda2a2ed55bdb4518f2e0c7a raw_io: fix passing retcode in test_api.stream_output (phajdan.jr@chromium.org)

TBR=martiniss@chromium.org,phajdan.jr@chromium.org
BUG=none

Recipe-Tryjob-Bypass-Reason: Autoroller
Review-Url: https://codereview.chromium.org/2251983002

infra/config/recipes.cfg

@@ -5,5 +5,5 @@ deps {
   project_id: "recipe_engine"
   url: "https://chromium.googlesource.com/external/github.com/luci/recipes-py.git"
   branch: "master"
-  revision: "f50a2af3c5190b5b9780855085bd5a8df0d4ec58"
+  revision: "6c19ddf62e5c5cdcfda2a2ed55bdb4518f2e0c7a"
 }