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/0fad0863959ecf172fb460a7008eeabf8c8f078d [swarming] Minor clean-up and typo fixes. (joshuaseaton@google.com)
  https://crrev.com/1236ebd26cbcfae759c3857b26bd9bd1cf3547d2 [file] Introduce SymlinkTree (joshuaseaton@google.com)
  https://crrev.com/19c28875c9f1519cac7156e07dbb8e59ff40f7c1 [isolated] Add download method (joshuaseaton@google.com)


TBR=borenet@google.com

Recipe-Tryjob-Bypass-Reason: Autoroller
Bugdroid-Send-Email: False
Change-Id: Id20f65557f4d8a9155c0162708f4c11b2dabd95d
Reviewed-on: https://skia-review.googlesource.com/c/179660
Reviewed-by: Recipe Roller <recipe-roller@chromium.org>
Commit-Queue: Recipe Roller <recipe-roller@chromium.org>

infra/config/recipes.cfg

@@ -14,12 +14,12 @@
   "deps": {
     "depot_tools": {
       "branch": "master",
-      "revision": "2cc6e25536698e4f87d516f5242dd9d30d3245ba",
+      "revision": "8cb79b0f8230f76c89531cd53a6c27ad9a169cac",
       "url": "https://chromium.googlesource.com/chromium/tools/depot_tools.git"
     },
     "recipe_engine": {
       "branch": "master",
-      "revision": "c3fbb33835795d43242ef673522148ade63a3cf0",
+      "revision": "19c28875c9f1519cac7156e07dbb8e59ff40f7c1",
       "url": "https://chromium.googlesource.com/infra/luci/recipes-py.git"
     }
   },