Move the cipd pin for lucicfg-1.8.16.

cipd-package: https://chrome-infra-packages.appspot.com/p/infra/tools/luci/lucicfg/linux-amd64/+/git_revision:10ffad287de65090e31b5d4f7ed6effe8655a439
release-note: https://crrev.com/c/2351178

R=vadimsh@chromium.org

Bug: 1115773
Change-Id: I1f73a22148b5c3c418837c87f89ac4620fe02912
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/2354760Reviewed-by: Vadim Shtayura <vadimsh@chromium.org>
Commit-Queue: Scott Lee <ddoman@chromium.org>