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/6769b4ea18de83ed9676b90a0893417a47be62cc Fix autoroller for gitiles (support commit metadata) (phajdan.jr@chromium.org)

TBR=martiniss@chromium.org,phajdan.jr@chromium.org
BUG=chromium:584079

Recipe-Tryjob-Bypass-Reason: Autoroller
Review-Url: https://codereview.chromium.org/2266003002

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: "990f604880743564b4d20029026487d7477c3ed3"
+  revision: "6769b4ea18de83ed9676b90a0893417a47be62cc"
 }