plpython: Add test for returning Python set from SETOF function

Peter Eisentraut <peter@eisentraut.org>

Commit: 231064aa0fbcdf12b7248e8d8d43a75482afbf1f
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2025-04-03T09:09:50Z
Releases: 18.0
plpython: Add test for returning Python set from SETOF function

This is claimed in the documentation but there was a no test case for
it.

Reported-by: Bogdan Grigorenko <gri.bogdan.2020@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/173543330569.680.6706329879058172623%40wrigleys.postgresql.org

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