Fix failures in incremental_sort due to number of workers

Tomas Vondra <tomas.vondra@postgresql.org>

Commit: 23ba3b5ee278847e4fad913b80950edb2838fd35
Author: Tomas Vondra <tomas.vondra@postgresql.org>
Date: 2020-04-06T22:02:07Z
Releases: 13.0
Fix failures in incremental_sort due to number of workers

The last test in incremental_sort suite prints a parallel plan, but some
of the buildfarm animals have custom max_parallel_workers_per_gather
values, causing failures. Fixed by setting the GUC to an explicit value.

Discussion: https://postgr.es/m/CAPpHfds1waRZ=NOmueYq0sx1ZSCnt+5QJvizT8ndT2=etZEeAQ@mail.gmail.com

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