Roll recipe dependencies (trivial).

R=
BUG=
TBR=martiniss@chromium.org

Review URL: https://codereview.chromium.org/1742643002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@298979 0039d316-1c4b-4281-b951-d872f2087c98

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: "9b8f51133cacf94fa74bcb5fab62e449a6298446"
+  revision: "af642c4ecd44e4919782351357c4c99808491c18"
 }