allow build with python 3.12.0: initialize new tp_watched

This fixes the build failure after I updated Ubuntu 24.04 (alpha),
which upgraded python 3.11.7 to python 3.12.0, causing the error:

libreoffice/pyuno/source/module/pyuno_callable.cxx:249:1:
error: missing initializer for member ‘_typeobject::tp_watched’
[-Werror=missing-field-initializers]
...

I gleaned this information from a July 2023 commit for
https://github.com/xbmc/xbmc/issues/23503

tp_watched was added in upstream commit python/cpython@82ccbf6
https://github.com/python/cpython/commit/82ccbf69a842db25d8117f1c41b47aa5b4ed96ab

This change first appeared in Python v3.12.0a1

Change-Id: If82ff1eb47d66d2669d90d6e00e0feff3c55b5ca
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/164775
Tested-by: Jenkins
Reviewed-by: Justin Luth <jluth@mail.com>
Reviewed-by: Stephan Bergmann <stephan.bergmann@allotropia.de>
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/164785

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