Roll recipe dependencies (trivial).

This is an automated CL created by the recipe roller. This CL rolls
recipe changes from upstream projects (recipe_engine) into this repository.

recipe_engine:
https://chromium.googlesource.com/infra/luci/recipes-py.git/+/5f437dc5800881abe0f78cf3b7c976817586a3ef
  5f437dc (tikuta@chromium.org)
      [swarming] update client

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

TBR=smcallis@chromium.org

Recipe-Tryjob-Bypass-Reason: Autoroller
Bugdroid-Send-Email: False
Change-Id: I7a41bae1a32cd2dc58ee5440f553587e9dbfbe73
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/config/+/2552094
Reviewed-by: Recipe Roller <recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Recipe Roller <recipe-mega-autoroller@chops-service-accounts.iam.gserviceaccount.com>
diff --git a/infra/config/recipes.cfg b/infra/config/recipes.cfg
index 29370df..17c3e52 100644
--- a/infra/config/recipes.cfg
+++ b/infra/config/recipes.cfg
@@ -15,7 +15,7 @@
   "deps": {
     "recipe_engine": {
       "branch": "refs/heads/master",
-      "revision": "061a2dcf8d72817b52b2957f7b643f5e2aa60c84",
+      "revision": "5f437dc5800881abe0f78cf3b7c976817586a3ef",
       "url": "https://chromium.googlesource.com/infra/luci/recipes-py.git"
     }
   },