[pinpoint]force using low version pickle
[pinpoint]force using low version pickle

Load pickle and update the highest version at the beginning of the service. This should force the app engine bundled to use the defined version.

Bug: chromium:1339701
Change-Id: I4177e41600ab10f518de55c47e1451696eb1997d
Reviewed-on: https://chromium-review.googlesource.com/c/catapult/+/3724621
Reviewed-by: John Chen <334fbfbb4df7c78f091ea1b77c69ca6ac731a3f3@chromium.org>
Commit-Queue: Wenbin Zhang <45ad8a1ff616a38a2202fd35571df81897c5f14f@google.com>

catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult,catapult-project/catapult