[PATCH] pl: fix can not build free-thread for plpython extension like 3.14t

[洪伊]

Hi dear hackers:

This patch fix can not build plpython for free-thread python like
python3.14t
which 3.14t is maintain in cpython team

for the doc:
https://github.com/python/cpython/blob/1857a40807daeae3a1bf5efb682de9c9ae6df845/Doc/howto/free-threading-extensions.rst#building-extensions-for-the-free-threaded-build

it needs to open the py_limited_api for free-thread build

Thanks
Hong Yi

v1-0001-Fix-PL-Python-build-with-Python-3.13-3.14-free-th.patch
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