Bug report

A clear and concise description of the bug

Followup to#103968 (comment).
The DeprecationWarning forPyType_Spec in3.12.0rc1 is emitted on<frozen importlib._bootstrap>:400 which makes it quite difficult to know what package is responsible.

In my particular case I found that, after reading#103968, it might beprotobuf.
And indeed that's how I can reproduce it.

# test.pyfromgoogle.protobufimportdescriptor

pip install protobuf==4.24.0python -X dev test.py

<frozen importlib._bootstrap>:400    DeprecationWarning: Using PyType_Spec with metaclasses that have custom tp_new is deprecated and will no longer be allowed in Python 3.14.

To be clear, I don't mind the warning. I'm just wondering if it's possible to improve the error location.
/CC@encukou

--
The relevant CPython code

And protobuf where it's likely (?) created:
https://github.com/protocolbuffers/protobuf/blob/v4.24.0/python/google/protobuf/pyext/map_container.cc#L562
https://github.com/protocolbuffers/protobuf/blob/v4.24.0/python/google/protobuf/pyext/map_container.cc#L778

Your environment

• CPython versions tested on:3.12.0rc1 and with the latest3.12 commit:3bb43b7
• Operating system and architecture: MacOS

Linked PRs

• gh-107810: Improve DeprecationWarning for metaclasses with custom tp_new #107834
• [3.12] gh-107810: Improve DeprecationWarning for metaclasses with custom tp_new (GH-107834) #107864