Revert "Prepare for Python "Limited API" in PL/Python"

Peter Eisentraut <peter@eisentraut.org>

Commit: f734c9fc3a91959c2473a1e33fd9b60116902175
Author: Peter Eisentraut <peter@eisentraut.org>
Date: 2025-02-26T20:58:38Z
Releases: 18.0
Revert "Prepare for Python "Limited API" in PL/Python"

This reverts commit c47e8df815c1c45f4e4fc90d5817d67ab088279f.

That commit makes the plpython tests crash with Python 3.6.* and
3.7.*.  It will need further investigation and testing, so revert for
now.

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