[led] Roll led to handle jobs with multiple swarming TaskSlices.

R=hinoka@chromium.org, nodir@chromium.org, tandrii@chromium.org

Bug: 875089
Change-Id: I6abb7a5d0aebf53c4c3ab6be309ed43e652278c0
Reviewed-on: https://chromium-review.googlesource.com/1222883
Commit-Queue: Robbie Iannucci <iannucci@chromium.org>
Commit-Queue: Ryan Tseng <hinoka@chromium.org>
Auto-Submit: Robbie Iannucci <iannucci@chromium.org>
Reviewed-by: Ryan Tseng <hinoka@chromium.org>

cipd_manifest.txt

@@ -16,7 +16,7 @@ $VerifiedPlatform linux-mips64 linux-mips64le linux-mipsle
 infra/tools/luci/vpython/${platform} git_revision:9a931a5307c46b16b1c12e01e8239d4a73830b89
 
 # LUCI editor
-infra/tools/luci/led/${platform} git_revision:9a931a5307c46b16b1c12e01e8239d4a73830b89
+infra/tools/luci/led/${platform} git_revision:9d677cda113ba49bea3ed50c9ed18aa8c6a09b11
 
 # Mac toolchain installer
 infra/tools/mac_toolchain/${os=mac}-${arch} git_revision:9a931a5307c46b16b1c12e01e8239d4a73830b89