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.
depot_tools:
  https://crrev.com/beeb6b4d5256e2595d77b84a7e1a617143e9b660 Deploy git 2.20.1 to depot_tools on a bleeding edge (tikuta@chromium.org)
recipe_engine:
  https://crrev.com/3e07686e1a32a7500c5bbd64f939c168546d360e [isolated] Re-roll isolated. (joshuaseaton@google.com)
  https://crrev.com/f749c4664feacab9484dc8e24ae350b1114f0d12 [swarming] add OWNERS (tikuta@chromium.org)
  https://crrev.com/e9bab63ca257c333247040e2d9503aad2045082d [file] Expose root of SymlinkTree (joshuaseaton@google.com)
  https://crrev.com/3b4c9d9b26618f331b01287b466946bd768170cd [swarming] roll swarming client (tikuta@chromium.org)


TBR=borenet@google.com

Recipe-Tryjob-Bypass-Reason: Autoroller
Bugdroid-Send-Email: False
Change-Id: I5aca230340b2908edb520c67d4b695e313cb6833
Reviewed-on: https://skia-review.googlesource.com/c/184660
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": "d1dba6482b227c3509df61e01b62644be329e0aa",
+      "revision": "165153fde173a3c1f799b9b8a497d019e138c004",
       "url": "https://chromium.googlesource.com/chromium/tools/depot_tools.git"
     },
     "recipe_engine": {
       "branch": "master",
-      "revision": "ed32454c59ca7ba6d05f313f32f75c1b8157d66e",
+      "revision": "3b4c9d9b26618f331b01287b466946bd768170cd",
       "url": "https://chromium.googlesource.com/infra/luci/recipes-py.git"
     }
   },