[swarming] Increase the number of max futures in cron abort_bot_missing
[swarming] Increase the number of max futures in cron abort_bot_missing

Bug: 1183873
Change-Id: I4713c0ae90a3776ad15c63d1e0a11742570e015e
Reviewed-on: https://chromium-review.googlesource.com/c/infra/luci/luci-py/+/3131344
Commit-Queue: Junji Watanabe <aaef61ef98ffea505db831f310be2a0eb8492537@google.com>
Commit-Queue: Takuto Ikuta <71927f930fca81015e0f496c65cd126ab1a692e3@chromium.org>
Auto-Submit: Junji Watanabe <aaef61ef98ffea505db831f310be2a0eb8492537@google.com>
Reviewed-by: Takuto Ikuta <71927f930fca81015e0f496c65cd126ab1a692e3@chromium.org>

luci/luci-py,luci/luci-py,luci/luci-py,luci/luci-py