[docker_pushes_watcher] Fix docker client version mismatch issue
[docker_pushes_watcher] Fix docker client version mismatch issue

Bug: skia:10285
Change-Id: Ie98b8ec9ec0c99bff539903158a6ca752ffa03c7
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/292558
Reviewed-by: Joe Gregorio <b9cf2471ff6d33504cafe8e6f356b732b2cadced@google.com>
Commit-Queue: Ravi Mistry <9fa2e7438b8cb730f96b74865492597170561628@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot