cas: roll client manually
cas: roll client manually

This is for isolate client update.

Bug: 1269721
Change-Id: I9281ced4f770eb6abd3c5a3597a981464c4c9cf8
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/recipes-py/+/3280377
Commit-Queue: Takuto Ikuta <71927f930fca81015e0f496c65cd126ab1a692e3@chromium.org>
Commit-Queue: Fumitoshi Ukai <0e88e065dd7f7d7f11da28b068df91c65342563c@google.com>
Auto-Submit: Takuto Ikuta <71927f930fca81015e0f496c65cd126ab1a692e3@chromium.org>
Reviewed-by: Fumitoshi Ukai <0e88e065dd7f7d7f11da28b068df91c65342563c@google.com>
Reviewed-by: Junji Watanabe <aaef61ef98ffea505db831f310be2a0eb8492537@google.com>

luci/recipes-py,luci/recipes-py