It's because it's currently rolled manually. We need to write an auto-roller but we're all slacking on this. I'll roll manually.

The following revision refers to this bug:
  https://chromium.googlesource.com/infra/infra/+/c2e050c72b65fdd16258100f845a263968fd39c1

commit c2e050c72b65fdd16258100f845a263968fd39c1
Author: Marc-Antoine Ruel <maruel@chromium.org>
Date: Tue Sep 25 16:49:33 2018

Roll infra/luci/ 353c65d6f..473a850bc (28 commits)

https://chromium.googlesource.com/infra/luci/luci-py/+log/353c65d6f9db..473a850bc451

$ git log 353c65d6f..473a850bc --date=short --no-merges --format='%ad %ae %s'
2018-09-21 maruel swarming: improve bootstrapping doc
2018-09-21 maruel config: improve bootstrapping doc
2018-09-21 maruel Improve bootstrapping documentation.
2018-09-20 maruel [swarming] update favicon to LUCY mascot, remove 'Server' from title
2018-09-19 maruel [swarming] Add code to trim old tasks and old TaskOutputChunk
2018-09-19 maruel [swarming] reduce error->warning for rebuild-task-cache failure
2018-09-19 bsheedy Add OSX lockscreen detection
2018-09-18 smut [Swarming] Drain indefinite leases on update
2018-09-18 maruel [swarming] Trim BotEvent older than 2 years
2018-09-14 maruel [machine_provider] increase max lease to 3 weeks
2018-09-14 vadimsh [auth-service] Give backend module 1GB instances.
2018-09-13 hinoka Increase max lease duration to 7d
2018-09-12 smut [GCE Backend] Validate GCE disk type and report to Machine Provider
2018-09-11 sergiyb python-adb: Print stack trace on failures to open an Android USB device.
2018-09-10 maruel [client] Enforce missing named cache hints
2018-09-06 maruel [swarming] Rename max_size to hint; index os
2018-09-06 maruel [swarming] fix named cache hint calculation
2018-09-05 smut [Swarming] Don't check early release time for indefinite leases
2018-09-05 smut [Swarming] Reject early_release_secs when lease_indefinitely is set
2018-09-04 brucedawson Print precise instructions on collecting swarming results
2018-09-04 maruel [swarming] fix inline expiration behavior during bot task polling
2018-09-04 maruel [swarming] Fill task_result in tasks/new on NO_RESOURCE
2018-09-04 maruel [swarming] Increase backend instance memory from 0.5Gb to 1Gb
2018-09-04 maruel [client] fix condition for object
2018-08-31 brucedawson Update README.md with contribution instructions
2018-08-31 brucedawson Print details when kill(9) fails
2018-08-30 smut [Machine Provider] Create dedicated catalog viewer group
2018-08-30 smut [Swarming] Return after each lease management step

Created with:
  roll-dep infra/luci

TBR=erickchen@chromium.org

Bug:  888569 
Change-Id: I6b5c184fffd1be0d0d71131d36ab57847f0cab93
Reviewed-on: https://chromium-review.googlesource.com/1238791
Reviewed-by: Marc-Antoine Ruel <maruel@chromium.org>
Commit-Queue: Marc-Antoine Ruel <maruel@chromium.org>
Cr-Commit-Position: refs/heads/master@{#17857}
[modify] https://crrev.com/c2e050c72b65fdd16258100f845a263968fd39c1/DEPS