Reference leak around sipPyTypeDict() on 3.12

[Ryo Miyamoto]

Hello,

Python v3.12 has added PyType_GetDict() API, which is used in SIP.
PyQt for 3.12 gets a new reference from sipPyTypeDict(), not borrowed.
It seems like SIP or PyQt misses a decref for the dictionary.

https://github.com/python/cpython/commit/a840806d338805fe74a9de01081d30da7605a29f
https://www.riverbankcomputing.com/hg/sip/rev/d36867e54192

Regards,
Ryo
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