Upgrade pants to the 1.3.0 dev series.
Upgrade pants to the 1.3.0 dev series.

This gets rid of an impossible to work around warning emitted by every
pants invocation and prepares for consuming an upcoming pants change
that will allow Aurora to use the thrift binary selected by
`build-support/thrift/thriftw` consistently everywhere.

Reviewed at https://reviews.apache.org/r/52915/

apache/aurora,medallia/aurora,apache/aurora,crashlytics/aurora,thinker0/aurora,rdelval/aurora,rdelval/aurora,rdelval/aurora,apache/aurora,apache/aurora,crashlytics/aurora,crashlytics/aurora,crashlytics/aurora,rdelval/aurora,medallia/aurora,thinker0/aurora,medallia/aurora,thinker0/aurora,medallia/aurora,crashlytics/aurora,rdelval/aurora,rdelval/aurora,thinker0/aurora,thinker0/aurora,crashlytics/aurora,thinker0/aurora,medallia/aurora,medallia/aurora,apache/aurora,apache/aurora